How can I get HDCP support on my PC?

I want to be able to play Blu Ray movies on my PC once I buy a BD Drive. My PC has a HDMI out for my HDTV, which is in a ATI Radeon HD 2400 XT(or Pro, on the label it says Pro but my PC recognizes it as a XT) Well when I check Audio Devices and ATI HDMI Output it says no support for HDCP. Can someone help me on this problem?