I didn't see any topic about this, so, I create mine.
It is the second time I watch a dvd and I want to post some snapshot but the movie is not registered in WTM database. (There were true movie, I mean, no video or short)
Do I need special rights to create a movie on the database ?
No, you don't. Just try to upload the shot as normal, and when the movie isn't in the database, you get a button asking you if you want to add the movie to the database. Click that and follow the steps (make sure to copy/paste the exact original title from IMDB and select the proper language).