Adopt REUSE machine-readable licensing standard

52 files changed, 105 insertions, 768 deletions

diff --git a/src/Action.hpp b/src/Action.hpp
index 0a13216..688a73c 100644
--- a/src/Action.hpp
+++ b/src/Action.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_ACTION_HPP
 #define PATCHAGE_ACTION_HPP
diff --git a/src/ActionSink.hpp b/src/ActionSink.hpp
index c0d92ec..7e023f8 100644
--- a/src/ActionSink.hpp
+++ b/src/ActionSink.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_ACTION_SINK_HPP
 #define PATCHAGE_ACTION_SINK_HPP
diff --git a/src/AlsaDriver.cpp b/src/AlsaDriver.cpp
index 8ad3569..41ee7c4 100644
--- a/src/AlsaDriver.cpp
+++ b/src/AlsaDriver.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "make_alsa_driver.hpp"
 
diff --git a/src/AudioDriver.hpp b/src/AudioDriver.hpp
index 06cfe7f..ac3d5ec 100644
--- a/src/AudioDriver.hpp
+++ b/src/AudioDriver.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_AUDIODRIVER_HPP
 #define PATCHAGE_AUDIODRIVER_HPP
diff --git a/src/Canvas.cpp b/src/Canvas.cpp
index d86049d..b244972 100644
--- a/src/Canvas.cpp
+++ b/src/Canvas.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "Canvas.hpp"
 
diff --git a/src/Canvas.hpp b/src/Canvas.hpp
index 943b399..4eef24e 100644
--- a/src/Canvas.hpp
+++ b/src/Canvas.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_CANVAS_HPP
 #define PATCHAGE_CANVAS_HPP
diff --git a/src/CanvasModule.cpp b/src/CanvasModule.cpp
index d9e3c9c..b567212 100644
--- a/src/CanvasModule.cpp
+++ b/src/CanvasModule.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2010-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2010-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "CanvasModule.hpp"
 
diff --git a/src/CanvasModule.hpp b/src/CanvasModule.hpp
index e86699c..7ce8950 100644
--- a/src/CanvasModule.hpp
+++ b/src/CanvasModule.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_CANVASMODULE_HPP
 #define PATCHAGE_CANVASMODULE_HPP
diff --git a/src/CanvasPort.hpp b/src/CanvasPort.hpp
index 3376e15..71c1117 100644
--- a/src/CanvasPort.hpp
+++ b/src/CanvasPort.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_CANVASPORT_HPP
 #define PATCHAGE_CANVASPORT_HPP
diff --git a/src/ClientID.hpp b/src/ClientID.hpp
index 911d2ec..7bf8faa 100644
--- a/src/ClientID.hpp
+++ b/src/ClientID.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_CLIENTID_HPP
 #define PATCHAGE_CLIENTID_HPP
diff --git a/src/ClientInfo.hpp b/src/ClientInfo.hpp
index 8acddfe..2dd755e 100644
--- a/src/ClientInfo.hpp
+++ b/src/ClientInfo.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_CLIENTINFO_HPP
 #define PATCHAGE_CLIENTINFO_HPP
diff --git a/src/ClientType.hpp b/src/ClientType.hpp
index 4785501..0812aa0 100644
--- a/src/ClientType.hpp
+++ b/src/ClientType.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_CLIENTTYPE_HPP
 #define PATCHAGE_CLIENTTYPE_HPP
diff --git a/src/Configuration.cpp b/src/Configuration.cpp
index e498487..679feb1 100644
--- a/src/Configuration.cpp
+++ b/src/Configuration.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "Configuration.hpp"
 
diff --git a/src/Configuration.hpp b/src/Configuration.hpp
index d98968f..9c9142d 100644
--- a/src/Configuration.hpp
+++ b/src/Configuration.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_CONFIGURATION_HPP
 #define PATCHAGE_CONFIGURATION_HPP
diff --git a/src/Coord.hpp b/src/Coord.hpp
index 2d6a85a..b24d7dc 100644
--- a/src/Coord.hpp
+++ b/src/Coord.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_COORD_HPP
 #define PATCHAGE_COORD_HPP
diff --git a/src/Driver.hpp b/src/Driver.hpp
index da11765..027e973 100644
--- a/src/Driver.hpp
+++ b/src/Driver.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_DRIVER_HPP
 #define PATCHAGE_DRIVER_HPP
diff --git a/src/Drivers.cpp b/src/Drivers.cpp
index 4f57f34..6341a63 100644
--- a/src/Drivers.cpp
+++ b/src/Drivers.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "Drivers.hpp"
 
diff --git a/src/Drivers.hpp b/src/Drivers.hpp
index ae3c063..c8938b8 100644
--- a/src/Drivers.hpp
+++ b/src/Drivers.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_DRIVERS_HPP
 #define PATCHAGE_DRIVERS_HPP
diff --git a/src/Event.hpp b/src/Event.hpp
index 233d1a1..0ad6b44 100644
--- a/src/Event.hpp
+++ b/src/Event.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_EVENT_HPP
 #define PATCHAGE_EVENT_HPP
diff --git a/src/ILog.hpp b/src/ILog.hpp
index d71059a..e5759a2 100644
--- a/src/ILog.hpp
+++ b/src/ILog.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_ILOG_HPP
 #define PATCHAGE_ILOG_HPP
diff --git a/src/JackDbusDriver.cpp b/src/JackDbusDriver.cpp
index 7710e56..4e9b23c 100644
--- a/src/JackDbusDriver.cpp
+++ b/src/JackDbusDriver.cpp
@@ -1,19 +1,6 @@
-/* This file is part of Patchage.
- * Copyright 2008-2020 David Robillard <d@drobilla.net>
- * Copyright 2008 Nedko Arnaudov <nedko@arnaudov.name>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2008-2020 David Robillard <d@drobilla.net>
+// Copyright 2008 Nedko Arnaudov <nedko@arnaudov.name>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "AudioDriver.hpp"
 #include "ClientType.hpp"
diff --git a/src/JackLibDriver.cpp b/src/JackLibDriver.cpp
index 8c804ba..927c923 100644
--- a/src/JackLibDriver.cpp
+++ b/src/JackLibDriver.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "AudioDriver.hpp"
 #include "ClientID.hpp"
diff --git a/src/Legend.cpp b/src/Legend.cpp
index 294f589..bdf51bc 100644
--- a/src/Legend.cpp
+++ b/src/Legend.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2014-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2014-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "Legend.hpp"
 
diff --git a/src/Legend.hpp b/src/Legend.hpp
index 81fbd86..e690120 100644
--- a/src/Legend.hpp
+++ b/src/Legend.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2014-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2014-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_LEGEND_HPP
 #define PATCHAGE_LEGEND_HPP
diff --git a/src/Metadata.cpp b/src/Metadata.cpp
index e75cf19..aa60582 100644
--- a/src/Metadata.cpp
+++ b/src/Metadata.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2014-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2014-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "Metadata.hpp"
 
diff --git a/src/Metadata.hpp b/src/Metadata.hpp
index 489c0b2..15d9672 100644
--- a/src/Metadata.hpp
+++ b/src/Metadata.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_METADATA_HPP
 #define PATCHAGE_METADATA_HPP
diff --git a/src/Options.hpp b/src/Options.hpp
index dd143fe..76846aa 100644
--- a/src/Options.hpp
+++ b/src/Options.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_OPTIONS_HPP
 #define PATCHAGE_OPTIONS_HPP
diff --git a/src/Patchage.cpp b/src/Patchage.cpp
index 7997354..29f6ecc 100644
--- a/src/Patchage.cpp
+++ b/src/Patchage.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "Patchage.hpp"
 
diff --git a/src/Patchage.hpp b/src/Patchage.hpp
index c3ed61d..f5462ce 100644
--- a/src/Patchage.hpp
+++ b/src/Patchage.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_PATCHAGE_HPP
 #define PATCHAGE_PATCHAGE_HPP
diff --git a/src/PortID.hpp b/src/PortID.hpp
index 2ef7a0c..e9011c9 100644
--- a/src/PortID.hpp
+++ b/src/PortID.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2008-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2008-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_PORTID_HPP
 #define PATCHAGE_PORTID_HPP
diff --git a/src/PortInfo.hpp b/src/PortInfo.hpp
index 3a4103d..860d1db 100644
--- a/src/PortInfo.hpp
+++ b/src/PortInfo.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_PORTINFO_HPP
 #define PATCHAGE_PORTINFO_HPP
diff --git a/src/PortNames.hpp b/src/PortNames.hpp
index 1ec7685..4dce7c6 100644
--- a/src/PortNames.hpp
+++ b/src/PortNames.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2008-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2008-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_PORTNAMES_HPP
 #define PATCHAGE_PORTNAMES_HPP
diff --git a/src/PortType.hpp b/src/PortType.hpp
index 9db0c1f..ec322b7 100644
--- a/src/PortType.hpp
+++ b/src/PortType.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_PORTTYPE_HPP
 #define PATCHAGE_PORTTYPE_HPP
diff --git a/src/Reactor.cpp b/src/Reactor.cpp
index b48d85d..6c9a508 100644
--- a/src/Reactor.cpp
+++ b/src/Reactor.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "Reactor.hpp"
 
diff --git a/src/Reactor.hpp b/src/Reactor.hpp
index 58b1ffc..4d92793 100644
--- a/src/Reactor.hpp
+++ b/src/Reactor.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_REACTOR_HPP
 #define PATCHAGE_REACTOR_HPP
diff --git a/src/Setting.hpp b/src/Setting.hpp
index 90fb124..9720ba2 100644
--- a/src/Setting.hpp
+++ b/src/Setting.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_SETTING_HPP
 #define PATCHAGE_SETTING_HPP
diff --git a/src/SignalDirection.hpp b/src/SignalDirection.hpp
index 94f5126..3d499a4 100644
--- a/src/SignalDirection.hpp
+++ b/src/SignalDirection.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_SIGNALDIRECTION_HPP
 #define PATCHAGE_SIGNALDIRECTION_HPP
diff --git a/src/TextViewLog.cpp b/src/TextViewLog.cpp
index 33b7d22..50d85b0 100644
--- a/src/TextViewLog.cpp
+++ b/src/TextViewLog.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "TextViewLog.hpp"
 
diff --git a/src/TextViewLog.hpp b/src/TextViewLog.hpp
index 5a91853..31b786d 100644
--- a/src/TextViewLog.hpp
+++ b/src/TextViewLog.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_TEXTVIEWLOG_HPP
 #define PATCHAGE_TEXTVIEWLOG_HPP
diff --git a/src/UIFile.hpp b/src/UIFile.hpp
index 28d7c82..6eb9d9c 100644
--- a/src/UIFile.hpp
+++ b/src/UIFile.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_UIFILE_HPP
 #define PATCHAGE_UIFILE_HPP
diff --git a/src/Widget.hpp b/src/Widget.hpp
index 3d13b91..d818210 100644
--- a/src/Widget.hpp
+++ b/src/Widget.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_WIDGET_HPP
 #define PATCHAGE_WIDGET_HPP
diff --git a/src/binary_location.h b/src/binary_location.h
index d3394f3..0cc3688 100644
--- a/src/binary_location.h
+++ b/src/binary_location.h
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2008-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2008-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include <dlfcn.h>
 
diff --git a/src/event_to_string.cpp b/src/event_to_string.cpp
index c8a6c42..159a863 100644
--- a/src/event_to_string.cpp
+++ b/src/event_to_string.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "event_to_string.hpp"
 
diff --git a/src/event_to_string.hpp b/src/event_to_string.hpp
index db55733..926065c 100644
--- a/src/event_to_string.hpp
+++ b/src/event_to_string.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_EVENT_TO_STRING_HPP
 #define PATCHAGE_EVENT_TO_STRING_HPP
diff --git a/src/handle_event.cpp b/src/handle_event.cpp
index fa543e6..373b74a 100644
--- a/src/handle_event.cpp
+++ b/src/handle_event.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #include "handle_event.hpp"
 
diff --git a/src/handle_event.hpp b/src/handle_event.hpp
index 5cf15ef..fae6d78 100644
--- a/src/handle_event.hpp
+++ b/src/handle_event.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2021 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2021 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_HANDLE_EVENT_HPP
 #define PATCHAGE_HANDLE_EVENT_HPP
diff --git a/src/jackey.h b/src/jackey.h
index 2c0e298..607eadb 100644
--- a/src/jackey.h
+++ b/src/jackey.h
@@ -1,18 +1,5 @@
-/*
-  Copyright 2014-2020 David Robillard <d@drobilla.net>
-
-  Permission to use, copy, modify, and/or distribute this software for any
-  purpose with or without fee is hereby granted, provided that the above
-  copyright notice and this permission notice appear in all copies.
-
-  THIS SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
-  WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
-  MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-  ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-  WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-  ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-  OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-*/
+// Copyright 2014-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef JACKEY_H
 #define JACKEY_H
diff --git a/src/main.cpp b/src/main.cpp
index 499db30..4466e15 100644
--- a/src/main.cpp
+++ b/src/main.cpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2022 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifdef __APPLE__
 #  include "binary_location.h"
@@ -91,7 +78,7 @@ void
 print_version()
 {
   std::cout << "Patchage " PATCHAGE_VERSION << R"(
-Copyright 2007-2020 David Robillard <d@drobilla.net>.
+Copyright 2007-2022 David Robillard <d@drobilla.net>.
 License GPLv3+: <http://gnu.org/licenses/gpl.html>.
 This is free software: you are free to change and redistribute it.
 There is NO WARRANTY, to the extent permitted by law.
diff --git a/src/make_alsa_driver.hpp b/src/make_alsa_driver.hpp
index cfd89c0..7f3b594 100644
--- a/src/make_alsa_driver.hpp
+++ b/src/make_alsa_driver.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_MAKE_ALSA_DRIVER_HPP
 #define PATCHAGE_MAKE_ALSA_DRIVER_HPP
diff --git a/src/make_jack_driver.hpp b/src/make_jack_driver.hpp
index 38aef65..79c6eb5 100644
--- a/src/make_jack_driver.hpp
+++ b/src/make_jack_driver.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2007-2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2007-2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_MAKE_JACK_DRIVER_HPP
 #define PATCHAGE_MAKE_JACK_DRIVER_HPP
diff --git a/src/patchage_config.h b/src/patchage_config.h
index 579a253..5cc311e 100644
--- a/src/patchage_config.h
+++ b/src/patchage_config.h
@@ -1,5 +1,5 @@
 // Copyright 2021-2022 David Robillard <d@drobilla.net>
-// SPDX-License-Identifier: ISC
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 /*
   Configuration header that defines reasonable defaults at compile time.
diff --git a/src/warnings.hpp b/src/warnings.hpp
index e8337a1..ee9b3d8 100644
--- a/src/warnings.hpp
+++ b/src/warnings.hpp
@@ -1,18 +1,5 @@
-/* This file is part of Patchage.
- * Copyright 2020 David Robillard <d@drobilla.net>
- *
- * Patchage is free software: you can redistribute it and/or modify it under
- * the terms of the GNU General Public License as published by the Free
- * Software Foundation, either version 3 of the License, or (at your option)
- * any later version.
- *
- * Patchage is distributed in the hope that it will be useful, but WITHOUT ANY
- * WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
- * FOR A PARTICULAR PURPOSE.  See the GNU General Public License for details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Patchage.  If not, see <http://www.gnu.org/licenses/>.
- */
+// Copyright 2020 David Robillard <d@drobilla.net>
+// SPDX-License-Identifier: GPL-3.0-or-later
 
 #ifndef PATCHAGE_WARNINGS_HPP
 #define PATCHAGE_WARNINGS_HPP