What reports are conflicting this? Anyways according to nVidia control panel both by Graphics card and screen (S2440L) are HDCP compliant, does that qualify as confirmation?
http://hardforum.com/showpost.php?p=1039431441&postcount=668
I have read various conflicting comments about the S-Line only supporting HDCP over DVI (not HDMI), and a chat session with a Dell guy didn't really clarify anything.
Confirmation would be to actually play some HDCP protected content - eg connect up a PS3 and play a Blu or something similar. That is about as confirmed as it gets.