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This article explains that if a copyright is orphaned or abandoned it is free game. Well this is true. I happen to own a Trademark and if I dont keep it enforce I will not have rights to it anymore. The same applies to certain copyrighted materials. Utility patents only last 17 years an to maintain them you have to cite a change in the art and re-apply to extend the original patent with the modifications.

This is support for the claim of need for the respect of copyrighted material

This link is an article written by Donna J. Abernathy. Supporting the nedd for copyrights and how they are protected. And what lines you cross when you use other peoples art/works.