IMO speaking TP is not restricted by licenses. i can speak it completely offline. and IMO it's designed primarily to be spoken, not written. so a paid or non-free book is not an obsticle, since TP's design philosophy wants to include everyone possible around the world (eliminating voiced/unvoiced plosive pairs, hard to pronounce vovwels, consonant clusters), so a latin based script does not belong to the language's core; there is even a Hangul script for TP.