Saw this little blurb over on PVRWire. Looks like the company Forgent Networks is filing a lawsuit over its Patent with the US Patent Office. (Number 6,285,746) From the PVRWire article, here is a clip of the patent:
A computer based television signal recording device is provided. This recording device allows for the recording of input streams onto a mass storage device such as a computer hard drive. A user interface is provided which has a list of the recorded television signals and the user can select for playback any of the listed recorded television signals.