Below is a link to Canopus. I have NOT used their products, but they have a good website to explore the many options for converting video signals, and burning DVDs using either Windows or Max OS X.
http://www.canopus.us/US/products/Index ... _index.asp
Most IEEE1394(firewire) computer inputs for video are centered on the DV video format used in camcorders. This is a DIFFERENT video format that any format of broadcast or cable video boxes ( At least I have not seen one that outputs in DV format). Thus conversions are needed, with the risk that drivers may not work.
In my case my computer is not in the same room as the DirecTV HR10-250 DVR so I chose a Toshiba DVD player/ burner with Hard Drive and intalled it in the same rack right above the DirecTV DVR. This Toshiba has a IEEE 1394 input- but this is for DV format camcorder input only. Ths DV 1394 input would NOT work with a cable DVR with a 1394 output. It has been intentionally crippled.
A laptop computer might be an answer.
I am not as familiar with PC laptops for burning DVDs, but some Apple Mac portables include a DVD burner, a Firewire input, and some excellent software at no added cost to burn DVDs from camcorders. If one purchased an external box to convert S-video and analog sound to DV firewire output format I see no reason a portable computer could not copy from a cable or DBS DVR and burn a DVD. Someone should try it.
In the rules FCC set up for allowing encrypted copying, home computer networks, including wireless networks, were allowed under these new rules, but with blocks on internet transmission or distributing copies to some other DVD player. The computer companies are sure to have products to do this.
Finally the there is a move for a court challenge to the FCC's right to "force" PC product makers into complying with these FCC rules on the grounds FCC has no authority. Stay tuned