The Jargon File

General Public Virus

Pejorative name for some versions of the GNU project copyright and the GPL in particular.

This licence requires that any tools or apps incorporating copyrighted code from these licences must be source-distributed on the same copyrighted terms as GNU stuff.

Therefore, one can spend years working on a project, somebody can sneak some GPL code in while you're not looking, and suddenly, before you know it, your code can never be used freely ever again, it always has to be distributed in a way Richard Stallman likes.
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