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by Smerity 3555 days ago
Not necessarily - they're listed as CC-BY on Flickr but that doesn't necessarily make it true. Specifically the user may not have authority to give out such copyright (as I assume for any case where the user "accidentally" set it to CC-BY they can't retract?)

Google included specific legalese on this very issue. See https://news.ycombinator.com/item?id=12616012