(via PVRBlog) Wired carries an interview with Tivo's lawyer, Matthew Zinn.

Sometime in the next few months, your machine will quietly download a patch that makes it respond to a new copy protection scheme from software maker Macrovision. The app puts restrictions on how long your DVR can save certain kinds of shows - so far, just pay-per-view and video-on-demand programs. It's the first time your TiVo won't let you watch whatever you want, whenever you want.
Slashdot covers the story as well.