Unverified60% confidenceFactExact time
Copyleft is a core legal mechanism proposed by Richard Stallman in the GNU project, requiring that derivative works be released under the same or a compatible license.
2
Sources
60%
Confidence
Long-term
Relevance
7/13/2026
First Seen
Sources
The OpenHaldex Controller "Open Source" Controversy: A Debate Over Name vs. Reality, and a Consumer's Guide
redditr/opensource7/10/2026
Related Claims
VerifiedThe copyleft mechanism was advocated by Richard Stallman in the free software movement.66% similarUnverifiedChain Replication was first proposed by Renesse and Schneider in their seminal paper.57% similarUnverifiedExisting patent law was drafted when the concept of 'inventor' was bound to the attribute of 'person'.53% similar
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