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GNU Project Rule

Modified versions must carry change notices and be licensed as a whole under the GPL

Catalog row in Vendor License Rules · Cited

Kind
Restriction
Statement
GPL-3.0 §5: a conveyed modified work must carry prominent notices stating that it was modified with a relevant date, and the entire work must be licensed, as a whole, under the GPL to anyone who comes into possession of a copy. GPL-2.0 §2(b) states the equivalent copyleft condition.
Applies when
Distribution of modified GNU software or works based on it.
Applies to
GPL-3.0; GPL-2.0
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