-AT_COPYRIGHT([dnl
-Copyright © 2015, 2019-2023 Nick Bowler
-License WTFPL2: Do What The Fuck You Want To Public License, version 2.
-This is free software: you are free to do what the fuck you want to.
+AT_COPYRIGHT([Copyright (C) 2015, 2019-2024 Nick Bowler
+License GPLv3+: GNU General Public License version 3 or any later version.
+This is free software: you are free to change and redistribute it.