I'm running a Toshiba HD-A20 through DVI-1 and Toslink and a Samsung BD-P1200 through DVI-2 and Toslink using cheap HDMI/DVI Adapter Cables then to my Sony TV also using a cheap HDMI/DVI Adapter Cable (All Belkin I believe). All through my 990 and all works excellent and switches just fine between the two, although there is sometimes a delay for the Video to kick in (5-15 Seconds) that I've attributed to an HDMI Handshaking issue. Based on this I'd say the 990 is HDCP compliant. Have you gone into your Video Input selection menu on the 990 to insure you've got the Video input set to the correct DVI-# for each device ? (Page 24ish of the manual).

Cheers; Snarl