For Videotron clients, the SA8300HD has software 22.214.171.124 and page 17 of 35 shows:
firebus = 126.96.36.199
fbdtcp = 188.8.131.52
which enables Firewire including the DTCP protocol.
As for copying recordings to a computer...
a Computer HDD has a set limit. Fail to see the interest of packing recordings to your computer when the SA8300HD can accept an external drive.
If the idea is store programs or movies permanently, my guess is that D-VHS and ultimately HD DVD or BD recording would be best. Unless it is possible to edit (such as removing commercials) before transferring to a permanent media.
Samsung LN52B750, SVS PB12-ISD, Harmony One, HD-A1, BDP-1400, Oppo DV-970HD, Yamaha RX-V371