So it seems that my 30" Cinema Display supports HDCP. I bought the display in December 2007 and use it with my PC. Recently, I added an LG GBW-H20L Blu-ray drive to my computer. The monitor is connected to an ATI 4870 video card through the DVI port and the 4870 supports HDCP. I put the Blu-ray "Batman Begins" in the drive out of curiosity to see what the error message would look like when I tried to play a Blu-ray movie on a non-HDCP monitor but the movie just played! I use the PowerDVD software that came with the Blu-ray drive. The installation disc also includes software called BD Advisor that checks your system's Blu-ray compatibility. The software confirms that my monitor supports HDCP. You can download the software from here: http://www.cyberlink.com/english/support/blu-ray_support/diagnosis.jsp I know Apple's specs say nothing about HDCP support but is it possible Apple added HDCP without telling anyone? I wouldn't be surprised if Apple did something like that. Anyone with another Blu-ray setup that can see if they can play movies on their 30" Apple monitor?