Ernie:

Based on discussions we had in the Digital Video class at CEDIA, any system that involves multiple displays being sourced from a common component could (and most likely will) have issues regarding HDCP. The source is not setup to respond to the EDID from two devices simultaneously.

All:

As for the solution to distributed video in the digital realm, the ultimate and best solution is Serial Digital (SDI). Unfortuneately, none of the major hardware manufacturers are ever going to give it to us because of the lack of DRM.
SDI sure looks to be the best solution due to simplicity, and a large installed base of broadcast facilities that have proven its robustness. To bad we'll never see it :(

Brad