Prism is a coalition of scholarly publishers who are advocating the merits of closed source scientific publication, and are lobbying for more copyright. However, their argument falls apart in many places, particularly in the fact that they violated copyright issues in the images they used in their website.
http://scienceblogs.com/cognitivedaily/2007/08/opening_knowledge_or_locking_i.php
Copyright advocates violate copyright in their site