what kind of cable do i need?

I have a lcd with a DVI-D WITH HDCP INPUT, and a card with a DVI-I , both say they are hdcp capable (whatever that means, or if it even works from what little i can understand).

So what capable would I get to get the best quality with these inputs?

 

HDCP is a type of digital copy protocol. More info is available here. I would think a regular DVI cable will work just fine. I think maybe you have HDCP mixed up with HDMI which has a different type of connector which almost looks like a SATA hard drive connector crossed with a bigger, flatter USB port. It look like this:
http://forum.ecoustics.com/bbs/messages/34579/383327.jpg http://forum.ecoustics.com/bbs/messages/34579/383328.jpg
DVI looks like this:
http://tbn0.google.com/images?q=tbn:63VRuoAAJe0eIM:http://static.howstuffworks.com/gif/single-dvi.jpg http://tbn0.google.com/images?q=tbn:jIO7KcbXRoG2_M:http://www.lyberty.com/encyc/articles/tech/img/all-DVI-types.jpg http://tbn0.google.com/images?q=tbn:67x3QWYfxwg86M:http://www.tech-faq.com/dvi-hdtv-connector.jpg
I hope this clears things up a bit....