https://www.gnu.org/licenses/gpl-3.0.en.html#section7
Quoting the relevant bit:
Notwithstanding any other provision of this License, for material you add to a covered work, you may (if authorized by the copyright holders of that material) supplement the terms of this License with terms:
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c) Prohibiting misrepresentation of the origin of that material, or requiring that modified versions of such material be marked in reasonable ways as different from the original version; or
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e) Declining to grant rights under trademark law for use of some trade names, trademarks, or service marks; or
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