There now that picking on Mark is done, I'll answer your question Nick.

Your old Disney movies are save. To be effected by Cinavia, the Cinavia code has to be built into the audio track. So just very new movies are effected and just from those companies who have chosen to use it. Wiki has a list of Cinavia embedded movies as well. It's not very long yet but it includes some bigger names.

With great power comes Awesome irresponsibility.