So your belief is that HDCP is, basically, only relevant to Bluray? That's clearly not the case. HDCP is relevant to how content is transmitted between devices. Cable or satellite providers could gimp their HD content if it is not transmitted over HDCP compliant digital connections. This sort of hack is most particularly relevant to on demand, cable, satellite, or over the air HD broadcasts as it could be used, for example, in some sort of HDCP hacked DVR to record that sort of content in HD and "in the plain". In a way this sort of reminds me of the old "hacked" cable boxes that let you watch all available cable broadcasts.
"I would rather claim to be an uneducated man than be mal-educated and claim to be otherwise." - Wookie 03:16