High-bandwidth Digital Content Protection (HDCP)—you can't live with it, but you practically can't buy an HD-capable device anymore without it. While HDCP is typically used in devices like Blu-ray players, HDTVs, HDMI-enabled notebooks, and even the Apple TV in order to keep DRMed content encrypted between points A and B, it appears that Apple's new aluminum MacBook (and presumably the MacBook Pro) are using it to protect iTunes Store media as well.

When my friend John, a high school teacher, attempted to play Hellboy 2 on his classroom's projector with a new aluminum MacBook over lunch, he was denied by the error you see above. John's using a Mini DisplayPort-to-VGA adapter, plugged into a Sanyo projector that is part of his room's Promethean system. Strangely, only some iTunes Store movies appear to be HDCP-aware, as other purchased media like Stargate: Continuum and Heroes season 2 play through the projector just fine. Attempts to play Hellboy 2 or other HDCPed films through the projector via QuickTime also get denied. Other movies that don't work include newer films like Iron Man, Star Wars: Clone Wars, and Love Guru, but older films like Shawshank Redemption are restricted as well.

The technology in Apple's MacBooks that prevents a seemingly arbitrary collection of iTunes Store files from being played on HDCP non-compliant devices is perhaps more accurately called DPCP, or DisplayPort Content Protection. As we've covered in the past, DisplayPort was designed as an open, extensible standard for computers that offers lower power consumption over DVI (especially in the Mini DisplayPort format that Apple uses on the new MacBooks). But more importantly, DisplayPort also beats DVI in the studios' books by offering the option of 128-bit AES encrypted copy protection.