Various people, including Thompson (who hold the MP3 patents) claim(ed?) that Ogg infringed on various patents they own.

There is an integer Ogg decoder for the ARM, but it is not open source; the people who implemented it have a special licence from Xiph so they don't have to give their code back to the open-source tree. This suprised me too, but the people at Xiph would probably like to eat!

Hugo