If you have any sites that contain enough work to make you fight to keep your rights as the own of that information then you really need to understand the world of copyrights.

Is someone using your work? - http://www.copyscape.com/

Licenses
http://creativecommons.org/
http://www.gnu.org/copyleft/gpl.html


http://whatiscopyright.org/
http://en.wikipedia.org/wiki/Wikipedia:Copyrights


What Can Go Wrong:
http://mathworld.wolfram.com/about/eric ... ntary.html


Other:
http://www.library.yale.edu/~okerson/copyproj.html
http://www.benedict.com/
http://www.nosoftwarepatents.com/
http://www.opensource.org/
http://en.wikipedia.org/wiki/Open_source
http://en.wikipedia.org/wiki/Open_source_culture


There are 1000's of documents all over the web on protecting Digital as well as Physical works so please make sure you understand them BEFORE you create a high-content site. Remember that Google is your friend.