Copyright law specifies who owns (and therefore who controls) a 'work.' In the case of software, it does not specify licensing terms. (As opposed to lyrics, mus

Copyright law specifies who owns (and therefore who controls) a 'work.' In the case of software, it does not specify licensing terms. (As opposed to lyrics, musical composition, musical recordings ... which do have compulsory licensing terms specified in law.) Neither the output of computer software, nor the ideas themselves within software, are protected by copyright. Not providing attribution is simply douchey.