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This is already a problem with anyone who ever copypastes from Stack Overflow. You're all violating CC-BY-SA[0] and nobody really cares about this.

If I ever take any code from SO, I include a comment with a link to it. Surely that's standard practice for anything longer than a line or two?

I do the same. I think it satisfies BY (attribution) but not SA (Share Alike).

As GP says, no one really cares, but it seems hard to satisfy SA... even if you are pasting into open source, is your license compatible with CC?

Perhaps I'm over-thinking this.