• What is Royalty-free license by Wikipedia
http://en.wikipedia.org/wiki/Royalty-free
• What is Rights Managed license by Wikipedia
http://en.wikipedia.org/wiki/Rights_Managed
• About Copyright by Wikipedia
http://en.wikipedia.org/wiki/Copyright
• About Moral rights by Wikipedia
http://en.wikipedia.org/wiki/Moral_rights
• Introduction to Rights & Licensing by Pro-Imaging
http://www.pro-imaging.org/content/view/160/131/
• Organiser’s Guide to the Bill of Rights by Pro-Imaging
assessments
 http://www.pro-imaging.org/content/view/426/199/