Some TV tuner cards like the DVR-250/350 or the TiVo chip deliver an MPEG-2 or other compressed stream directly to the computer, performing both the frame grabbing and compression in silico. This greatly reduces the load on the CPU allowing an overall cheaper implementation.

Analog Broadcast Copy Protection

Many mass-produced consumer DVRs implement a copy-protection system called CGMS-A (Copy Generation Management System–Analog). This encodes a pair of bits in the VBI of the analog video signal that specify one of the following settings:

Copying is freely allowed

Copying is prohibited

Only one copy of this material may be made

This is a copy of material for which only one copy was allowed to be made, so no further copies are allowed.
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