DVI-HDCP is DVI-D + DRM features and you should be able to just plug it straight into a DVI socket on your PC.

It's supposed to prevent you from snagging a digital copy of the signal because they encrypt it but bypass devices have already been released. If you plug a device which requires a HDCP display device into something which doesn't have HDCP then it will downgrade the output signal i.e. lower the resolution.