First of all, wow! We anticipated requests for level editor but didn't quite expect the users to put effort to reverse engineer their own. It's very nice to see the level of interest Angry Birds has received from the Maemo community. As for any possible legal issues no worries, go for it! On the other hand, we do have had discussions about our own level editor too but no concrete plans have been made yet. And because of that unfortunately I can't promise you any support currently. If you have any suggestions regarding the level editor or Angry Birds in general we're all ears.