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If the protection of defensive patents was really Facebook's concern this could have been addressed by using the Apache 2.0 license. The patent grant is clearly

by tssva 9y ago

If the protection of defensive patents was really Facebook's concern this could have been addressed by using the Apache 2.0 license. The patent grant is clearly limited to its use in regards to the specific licensed work and if you file a patent suit regarding the work the grant is revoked.

chrisco255 9y ago
Correct, but in this case, it wouldn't have protected them from Yahoo, for example. Yahoo was suing over other, unrelated patents. Facebook had to counterclaim in order to stave off the lawsuit.