Unverified50% confidenceFactExact time
Permissive licenses allow closed-source commercial use and require only that copyright and license notices be retained; copyleft licenses (such as GPL) require derivative works to be released under the same license.
1
Sources
50%
Confidence
Long-term
Relevance
11/1/2026
First Seen
Sources
Related Entities
Related Claims
UnverifiedThe GPL (GNU General Public License) sets the condition that anyone may freely use, modify, and distribute the code, but must release derivative works under the same license — the "Copyleft" mechanism.80% similarVerifiedCopyleft licenses (such as GPL, LGPL, and AGPL) require that derivative works be released under the same or compatible open-source licenses.79% similarUnverifiedOpen-source licenses (such as GPL and MIT License) impose restrictions on the manner in which software is used through contractual terms.78% similarUnverifiedThe open-source licensing mechanism is built on top of the copyright system, using the exclusive rights granted by copyright law to achieve open sharing; if copyright were completely abolished, licenses such as the GPL would lose their legal effect.78% similarUnverifiedLibreOffice adopts open-source licenses such as MPL (Mozilla Public License), which carry explicit distribution obligations, such as providing access to source code and retaining copyright notices.78% similar
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