@kazuya: TSD took most of its forms from Japanese sources, though they changed them a bit, of course. We do the pinan kata, though we call them pyung ahn hyung, as well. If you've seen mix01, also on my youtube channel, you'll see parts of pyung ahn sa dan and pyung ahn o dan, the 4th and 5th pyung ahn forms. Also, we do variations of the "naihanchi" forms, though we call them "keema hyung," basically a direct translation. Even the name "Tang Soo Do" can be seen as a direct translation of "Karate-do." All martial arts share things; it's inevitable.
If anyone's interested in martial arts discussions, I'd point them to the MartialTalk forums: http://www.martialtalk.com/forum. I post regularly in the TSD forums there.