Mac Pros blocked from iTunes HD output over DVI?

Some Mac Pro owners may find themselves unable to properly view HD-quality video bought or rented from the iTunes Store, an account alleges. In the wake the iTunes 8.1 update, at least one user is said to have discovered that his Mac Pro will no longer play HDCP-encoded iTunes videos over DVI output, despite previously having support with a GeForce 7300GT video card attached to a Samsung T240 monitor. The issue is also said to be linked to a firmware update for the 7300GT, which may have disabled HDCP on the device without notice.

Apple is said to be aware of HDCP problems on Mac Pros, and currently in the process of developing an update to unblock content. In the meantime the only solution is to revert to iTunes 8.0.2, which may allow playback of HD TV shows, but not movies. The problems may be related to ones discovered with recent MacBooks, though MacBooks must connect to DVI devices through a Mini DisplayPort adapter.

source:macnn