PlayReady

PlayReady is a Digital Rights Management (DRM) from Microsoft for portable devices. It was announced in February 2007.^[1]

The main differences relative to previous DRM schemes from Microsoft are:

• Some popular features that were already present in other consumer restriction schemes in the market have been added; these include the concept of domain (group of devices belonging to the same user which can share the same licenses), Embedded Licenses (licenses that are embedded in the content files, avoiding a separate step for license acquisition) and envelopes (the ability to DRM arbitrary, potentially non-media content). It is also the protection scheme for IIS Smooth Streaming, Microsoft's adaptive streaming technology.

• It is intended to be platform independent: unlike other Microsoft consumer restriction schemes like Janus, PlayReady can be ported to any kind of portable device, even if it uses non-Microsoft technology (OS, codecs, media player, etc.).

PlayReady competes with other proprietary DRM schemes, most notably Apple's FairPlay (which has entered the mobile phone market through the iPhone) and several other consumer restriction schemes that are competing to become the dominant consumer restriction technology (e.g. OMA DRM).

Microsoft released the first version of the PlayReady suite (Porting Kit for devices, PC SDK and runtime, Server SDK) in June 2008. Silverlight 2.0, released in October 2008, supports content restricted with PlayReady. As of Silverlight 4.0, the implementation of Microsoft PlayReady in Silverlight supports offline content (via persisted license), subscription scenarios (via chained licenses) and online, streaming-only content (via simple non-persistent licenses). Output protection support was also added in Silverlight 4.0.

PlayReady is supported on the Silverlight implementation of Windows Phone 7.

Windows Media Center TV Pack 2008 and Windows 7 can allow content providers, such as TV stations, to use the PlayReady PC runtime to locally encrypt premium TV content, including otherwise unrestricted cable and satellite TV signals.

Interoperability

• PlayReady is backwards compatible with Windows Media DRM 10 content, meaning that content encrypted with WM DRM 10 (for instance, content for PlaysForSure devices) will play on a PlayReady terminal.
• PlaysForSure compliant devices won't play PlayReady-encrypted content.

References

External links

• Official PlayReady website
• Microsoft ready to play with PlayReady - The Register, 13 February 2008
• MSDN explanations & code snippets
• PlayReady DRM in Silverlight