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Privacy advocate challenges YouTube's ad blocking detection
(www.theregister.com)
This is a most excellent place for technology news and articles.
note how this explicitly leaves out modification.
once again, they exclude modification of the code.
no forks can be made because they aren't allowed to modify the app in anyway.
Additionally, the termination clauses say that they can just terminate your rights to use the code if they feel like it, no other reason needed. This is a direct attack against open source.