schnikies79 wrote to mention an article on the Times Online site, where they report that a 'substantial number' of Vista PCs will be unable to play HD-DVDs or Blu-ray discs, as a result of DRM requirements made by the operating system. From the article: "Dave Marsh, the lead program manager for video at Microsoft, said that if the PC used a digital connection to link with the monitor or television, then it would require the highest level of content protection, known as HDCP, to play the discs. If it did not have such protection, Vista would shut down the signal, he said."
Link To Original Article