[License-discuss] Strong and weak copyleft

[Lawrence Rosen]

Patrice-Emmanuel Schmitz referred me to this thought-provoking link:

 

https://joinup.ec.europa.eu/community/eupl/news/meaning-%E2%80%9Ccopyleft%E2
%80%9D-eupl

 

Can anyone here precisely identify the language in the GPL licenses that
makes it "strong" rather than "weak" copyleft? And can anyone here identify
anything in copyright law or cases that allow this distinction in the
meaning of "derivative work"?

 

/Larry

 

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