As far as I'm aware, the content available at themoviedb.org is licensed to others under the CC-by-NC license v3:
http://creativecommons.org/licenses/by-nc/3.0/
I agree that they need to clean up their site somewhat in this regard. When you add a movie you get a page that states:
Quote:Thank you for helping us to extend our movie database. All information on TMDb is licensed under the terms of the Creative Commons Attribution-ShareAlike 2.0 License. By adding a new movie you accept the terms of that license. More information can be found in the copyright section.
This is complicated by the fact that the links that the above quote contains are broken and, when fixed (replace ?page= with /), lead to pages written in german. Clearly there needs to be some work done to remedy this and make it clear to all contributors exactly what they're contributing too.
To address what theophile brought up on their forums:
In either case, you cannot take content from IMDb.com, or any other site and contribute it to TheMovieDB.org unless:
1. You own the copyright to it.
2. The license that the content is under allows it.
Simple as that. The IMDb data, therefore, only allows option 1, unless for whatever reason you can show it to be not covered by copyright law.
It looks like travis needs some work to tidy up the licensing problems. I'll contact him personally and see if there's anything we (team xbmc) can do to help in this regard.
Cheers,
Jonathan