Intellectual Property and Accessibility (w11)
The Ko and Rossen, Chapter 8: Copyright, Intellectual Property, and Open Educational Resources, to p. 241, makes a clear description of the topic but it applies to the United States only.
The Creative Commons Licensing
An interesting perspective!
When teachers or students want to use content created by another teacher or student, they need contact the content creator to obtain the permission. A Creative Commons license makes this process easier, because the creator identifies the use rights before the publishing.
Creative Commons – Wanna Work Together?
A really good introduction to this issue by The World Wide Web Consortium (W3C) describing policies, resources and tools to make the Web accessible.