Google Advanced search provides the ability to search for data with certain usage rights (creative commons). How can I tag my data to indicate the usage rights?
Marking content as creative commons for search engines
creative commons
There is a license chooser generator on the creativecommons.org website. The generator helps you chose the correct licence and then will generate a code for you to add to your page.There is also more information on licence mark up best practices on the page below:Best Practices for Marking Content with CC Licenses: Creators