The Tango Desktop Project recommends using the Creative Commons Attribution-ShareAlike 2.5 license for artwork. The Tango Desktop Project themes will be available under this license.
You are free to:
- copy, distribute, display, or perform the work
- make derivitive works
- make commercial use of the work
As long as:
- You give proper attribution to the author(s)
- All derivitive works adhere to the Creative Commons Attribution-ShareAlike License
- The terms of this license are made clear in any distributions of the work
Any of the requirements may be waived by the copyright holder of the work in question.