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That is answered in the article:

"CLAs shift the legal risk for copyright infringement, patent infringement or other bad acts, intentional or otherwise, from the project (the entity best positioned to defend a legal claim, and often the one most directly benefiting financially), to the contributor"

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Okay. But still if a person contributes code that is not their code, even if they sign a CLA, and it ends up in the project the project can't say "not our problem they signed a CLA". The project would still need to remove the offending code.

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