diff --git a/LICENSE b/LICENSE
index ba923abd782d6fbe7d529738c01508c783d81391..22686f9fe879acaa7d1db639310a955de05b0d2a 100644
--- a/LICENSE
+++ b/LICENSE
@@ -1,6 +1,6 @@
                     GNU AFFERO GENERAL PUBLIC LICENSE
                        Version 3, 19 November 2007
-                              AGPL-3.0-or-later
+                              AGPL-3.0
 
  Copyright (C) 2007 Free Software Foundation, Inc. <https://fsf.org/>
  Everyone is permitted to copy and distribute verbatim copies
diff --git a/api.go b/api.go
index b219b551c4f79386607492b2bb7cd67686801cc0..04f187db642f2739d09d49e2c7e82d5d1b8537e5 100644
--- a/api.go
+++ b/api.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/api_test.go b/api_test.go
index 84741375c68f6bff8583dad505c1b36eaa86231d..d402296d0c6c1c04a197c09124420b8aaeb057fb 100644
--- a/api_test.go
+++ b/api_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/command.go b/command.go
index a523d1574be03c3553d8f7095f97fb4d2c4a4092..ff7f5540aba2813c1e67e51653d566f763fbb0bb 100644
--- a/command.go
+++ b/command.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/command_test.go b/command_test.go
index 9afdf831937353b65e8030cc1c32e3a9289c08fe..f7cb51d202cb6249eab4225484d61954fc163de7 100644
--- a/command_test.go
+++ b/command_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/doc.go b/doc.go
index 01eada321d024490213846d0cb6c6ffa72c8cd76..b252df1527633d78f26f378caa6b1e015ce2c26e 100644
--- a/doc.go
+++ b/doc.go
@@ -2,7 +2,7 @@
 // with subcommands. It is based on the flags package from
 
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 // This program is free software: you can redistribute it and/or modify
 // it under the terms of the GNU Affero General Public License as published
diff --git a/error.go b/error.go
index 9aa6a32ce8958c5c0501d82b693f5277012299c4..a0eca944cc2e58a86187d71d516b4503c223b612 100644
--- a/error.go
+++ b/error.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/error_test.go b/error_test.go
index e05a12a7e5a828171c60add930aa8fb8b201ea12..ddc568a9126c68dabfc548979648c3aa87e96e9b 100644
--- a/error_test.go
+++ b/error_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/execute.go b/execute.go
index 5acb3aee89d0d76a926b7a63435975bd1344051d..447787bd4392b9d43590662e01640505fd7f2814 100644
--- a/execute.go
+++ b/execute.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/execute_test.go b/execute_test.go
index 5d2f670bfb72a9f102c7bb93dc26bf0e27743ed8..aebd1bfb5a5eb5a85d24a2581f7490689f671eb0 100644
--- a/execute_test.go
+++ b/execute_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/flag.go b/flag.go
index 79970a31cd84d33710fc94d8c364e1b59f7a052e..10cdbfcbc6de3e6db95c0a9cc4e20bf7926dadef 100644
--- a/flag.go
+++ b/flag.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/flag_test.go b/flag_test.go
index 802d06fbe793b2a2435d9e04ce5e270a1e7f991b..b16203682c0ef73a398030409e3815cd7e53e8f4 100644
--- a/flag_test.go
+++ b/flag_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/integration_test.go b/integration_test.go
index 5107d7ab2a3d3b26568a77c6457dae948d8d649e..d478674eab52a60be49358f71f2dc634b66c7ba5 100644
--- a/integration_test.go
+++ b/integration_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/parse.go b/parse.go
index 5df9a73589da66f6fae4d81ee48e99b34ad09663..5d10b058602a102721e5ea63ec4185a0db7dc163 100644
--- a/parse.go
+++ b/parse.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/pathfind.go b/pathfind.go
index 29c1644292c094ea5658208952f2d33f291ba9f5..3b23e8ea3687f960ebe0cdb1e56e677e20f0aa8d 100644
--- a/pathfind.go
+++ b/pathfind.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/pathfind_test.go b/pathfind_test.go
index 447151279a966abd224e6820a63e6603535b3686..6a4e7cd897388adacbed808a8a1deca73a744f49 100644
--- a/pathfind_test.go
+++ b/pathfind_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/readme_test.go b/readme_test.go
index cb3a04e498e301e8b4f4be57f36fd9376a298416..8f9a2fba6fa3e78dc3285488658b605f889e0dd1 100644
--- a/readme_test.go
+++ b/readme_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/setting.go b/setting.go
index 9b3d3e6850dfb339fb76b78105257c29f9558250..d2e7445c5ed6bdd45f5d28bc8233f546b5c7fc51 100644
--- a/setting.go
+++ b/setting.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/setting_test.go b/setting_test.go
index b202cffe0012f82afc5cc6454809edbdbea5e5cd..699ced4b29712879c9b1405e3a86984900e7190f 100644
--- a/setting_test.go
+++ b/setting_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/shadow.go b/shadow.go
index e11e572da4730c27f7790d5002e8c197e154a692..a05534f4371300aac1c397c2e6bd98f74c8a65db 100644
--- a/shadow.go
+++ b/shadow.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/shadow_test.go b/shadow_test.go
index 177ea48886464082d4109ced3fb9b7d6501a0056..5a0b052c6d12cf82ac8cc2a5b3838c205905fc66 100644
--- a/shadow_test.go
+++ b/shadow_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/tags.go b/tags.go
index 790f634a0ba87e6443088e9b1851f03c59402834..bf400a08f7750f3b8781caefcda3fdda78f50632 100644
--- a/tags.go
+++ b/tags.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags
 
diff --git a/tags_test.go b/tags_test.go
index 319b8b7f4cb8d0aa356e45c9c51dd978f0b718b6..f6485049ef10116200a962cee9deb7b2bd04a64a 100644
--- a/tags_test.go
+++ b/tags_test.go
@@ -1,5 +1,5 @@
 // Copyright 2022 schukai GmbH
-// SPDX-License-Identifier: AGPL-3.0-or-later
+// SPDX-License-Identifier: AGPL-3.0
 
 package xflags