Originally posted by: tdawg
HDCP is not limited to PC monitors. HDCP (High Definition Content Protection) is the hollywood demanded encryption/protection standard that will have to be present to play HD content at HD resolutions from an HD-DVD/Blu-Ray player, be it a standalone device or a drive in a PC. HDCP is a secure pathway from the device being used to read the HD content, to the display receiving the HD content. Like somebody said above, it's a key--embedded in each HDCP-compliant device is a chip with HDCP codes or whatever they use.
Any HD TV that has HDMI connectors must be HDCP compliant, but any TV's that don't include HDMI connections and don't explicitly say they are HDCP compliant (via DVI, or some other digital connection), then they may not be. If you ever want to watch HD content on your PC, you will need an HDCP-compliant OS, and HDCP-compliant video card and and HDCP-compliant monitor, otherwise the HD content will either be scaled down to SD resolutions, or will not play at all. If you buy and HDTV and plan to hook up an HD-DVD/Blu-Ray player, you will need an HDCP-compliant TV, otherwise the content will be scaled down to SD resolutions or refuse to play at all.
I don't think the XBOX360 requires HDCP compliance to display games in their HD resolutions (720p, 1080i, 1080p, if possible), but I imagine the add-on HD-DVD player will require an HDCP compliant display if you want to watch HD-DVDs (hollywood won't let them skirt HDCP). The PS3 will also require you to have an HDCP-compliant display if you want to watch Blu-Ray movies at their 1080p resolution.
Google is a great place to get all the HD education you need before making any purchase if you actually want to understand all the issues surrounding HD content.