Gustavo,
dois textos que a Carolina acaba de me passar e podem ser úteis para você:
Removing the nc: why license restrictions on commercial use are problematic and (frequently) unnecessary http://blog.okfn.org/2006/04/24/removing-the-nc/
e
What status for "open"? An examination of the licensing policies of open educational organizations and projects http://learn.creativecommons.org/cclearn-reports
[]'s,
Tom