20 Questions and Answers about Win Vista's DRM (Digital Rights Management)
Ready or not here it is....

A conversation has cropped up since the recent publication of a paper scrutinizing how Windows handles digital rights management, especially for HD video. I've since looped back with Dave Marsh, a Lead Program Manager responsible for Windows' handling of video, to learn from him the implications involved and to learn to what extent the paper's assertions are accurate. The following is an article Dave has put together to address the misconceptions in the paper, followed by answers to what we expect will be the most frequent questions in the minds of our customers. Leave us a comment to let us know what you think. -- Nick

Over the holidays, a paper was distributed that raised questions about the content protection features in Windows Vista. The paper draws sharp conclusions about the implications of those features for our customers. As one of the Lead Program Managers for the technologies in question, I would like to share our views on these questions.

Windows Vista includes content protection infrastructure specifically designed to help ensure that protected commercial audiovisual content, such as newly released HD-DVD or Blu-Ray discs, can be enjoyed on Windows Vista PCs. In many cases this content has policies associated with its use that must be enforced by playback devices. The policies associated with such content are applicable to all types of devices including Windows Vista PCs, computers running non-Windows operating systems, and standalone consumer electronics devices such as DVD players. If the policies required protections that Windows Vista couldn't support, then the content would not be able to play at all on Windows Vista PCs. Clearly that isn't a good scenario for consumers who are looking to enjoy great next generation content experiences on their PCs.

Associating usage policies with commercial content is not new to Windows Vista, or to the industry. In fact, much of the functionality discussed in the paper has been part of previous versions of Windows, and hasn’t resulted in significant consumer problems – as evidenced by the widespread consumer use of digital media in Windows XP. For example:

• Standard definition DVD playback has required selective use of Macrovision ACP on analog television outputs since it was introduced in the 1990s. DVD playback on and in Windows has always supported this.
• The ability to restrict audio outputs (e.g., S/PDIF) for certain types of content has been available since Windows Millennium Edition (ME) and has been available in all subsequent versions of Windows.
• The Certified Output Protection Protocol (COPP) was released over 2 years ago for Windows XP, and provides applications with the ability to detect output types and enable certain protections on video outputs such as HDCP, CGMS-A, and Macrovision ACP.

It's important to emphasize that while Windows Vista has the necessary infrastructure to support commercial content scenarios, this infrastructure is designed to minimize impact on other types of content and other activities on the same PC. For example, if a user were viewing medical imagery concurrently with playback of video which required image constraint, only the commercial video would be constrained -- not the medical image or other things on the user's desktop. Similarly, if someone was listening to commercial audio content while viewing medical imagery, none of the video protection mechanisms would be activated and the displayed images would again be unaffected.

Contrary to claims made in the paper, the content protection mechanisms do not make Windows Vista PCs less reliable than they would be otherwise -- if anything they will have the opposite effect, for example because they will lead to better driver quality control.

The paper implies that Microsoft decides which protections should be active at any given time. This is not the case. The content protection infrastructure in Windows Vista provides a range of à la carte options that allows applications playing back protected content to properly enable the protections required by the policies established for such content by the content owner or service provider. In this way, the PC functions the same as any other consumer electronics device.

With that introduction, here are the top twenty questions, and answers, that aim to address some of the other points raised in the paper.

Read all about it here, courtesy of windowsvistablog.com.

-Eric