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Re:University of Illinois issues DMCA takedown for previous ... by clock86 on Wednesday February 11, 2015 @10:42AM (#9033428)
I'm guessing it is more likely that these repositories were searched for by staff/professors than fully specific code was searched for.

I don't think you can claim that changing code absolves you of copyright issues, it might make it harder to find though.

Re:University of Illinois issues DMCA takedown for previous ... by lmm on Wednesday February 11, 2015 @10:54AM (#9033517)
APIs shouldn't be copyrightable as they're necessary for interfacing. The solution to a homework problem shouldn't be a derivative work of the problem, and so it should be possible to distribute the solution in a way that doesn't infringe on the university's copyright.