Matt Haughey at PVRblog has details about some outrageously customer-hostile new “features” rolled out by TiVo. I can’t see any rational reason why a content provider should be able to limit how long a program can be saved on your DVR.
TiVo gets ugly with DRM
Published
Ed Bott 
I talked to a TiVo executive about this today. Turns out what people are seeing are bugs – false positives. This is mostly to be used with video-on-demand and pay per view. It’s not supposed to be blocking reruns of “King of the Hill.”
http://blogs.chron.com/techblog/archives/2005/09/copy_protection.html