D'source is available as part of OPEN DESIGN Initiative. The Open Design initiative is very much like the Open Source initiative whereby D'source initiative is made available free to use as well as for further development.

D'source contnet is licensed under Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License

You can read the details here:
http://creativecommons.org/licenses/by-nc-sa/4.0/
and here:
https://creativecommons.org/licenses/