The most basic of the Creative Commons Licensense is Attribution (CC-BY).
You are allowed to:
- Share i.e. copy, distribute and transmit the work
- Remix i.e. adapt the work
- Use the work commercially
You must attribute the author of the original work in the manner specified by the author.
The associated icon is:
More information can be found here: http://creativecommons.org/licenses/by/3.0/
Best practices on how to attribute an author in specific types of media can be found here: http://wiki.creativecommons.org/Marking/Users#Marking_Specific_Media