Has any university ever successfully asserted ownership over its student's work? Legally how does the university acquire ownership? I don't see how use of unive

Has any university ever successfully asserted ownership over its student's work? Legally how does the university acquire ownership? I don't see how use of university facilities give the university ownership. Further, the students paid the university. When did universities acquire the right to steal people's work without paying for it? Universities may think they are the government, but I don't see how they acquire such rights, legally. Are students considered the university's slaves?