Janus (DRM)

Janus (DRM)

Janus is the codename for portable version of Windows Media DRM for portable devices, whose marketing name is Windows Media DRM for Portable Devices (or in short form WMDRM-PD) introduced by Microsoft in 2004 for use on portable media devices which store and access content offline. Napster To Go was the first online music store to require the Janus technology. Supporting Janus often implies that the device also make use of the Media Transfer Protocol (MTP).Note that Janus initially required supporting devices to "not" support non-Microsoft audio formats such as Ogg Vorbis, however this has since been revoked. cite web
last = Greene
first = Thomas
date = 2006-09-05
url = http://www.theregister.co.uk/2005/10/27/accidental_music_monopoly_bid
title = Judge blasts MS bid to monopolize music devices
format = HTML
accessdate = 2007-01-05]

Characteristics

To support Janus devices must support:

* Secure time
* License storage for content items
* Meters

All these are supported by way of challenge-response authentication commands.

tores that require Janus on portable devices

* AOL Music Now
* iMesh
* BearShare
* Napster To Go
* F.Y.E. Download Zone
* Yahoo! Music Unlimited
* Rhapsody To Go
* Ruckus
* Tesco Downloads
* Zune Marketplace
* SpiralFrog

Portable devices that use Janus

* Audiovox SMT 5600 Smartphone
* Toshiba Gigabeat S
* Cowon iAudio X5 (as of firmware 2.11b1)
* Cowon iAudio U3
* All Creative Zen portable players (except the Creative Zen Stone and Stone Plus)
* Dell DJ 20GB (Gen 2)
* Dell DJ 30GB
* Dell Pocket DJ
* iriver Clix
* iriver H10 series (with MTP firmware only)
* iriver H320 (US version only, after upgrading to EU/KR/JP firmware DRM capabilities are lost)
* iriver H340 (US version only, after upgrading to EU/KR/JP firmware DRM capabilities are lost)
* iriver PMC-120 (Portable Media Center)
* Samsung YH-925 (Not Australian or European version as you lose onboard radio if you upgrade the firmware)
* Samsung YH-999 Portable Media Center
* Samsung YP-T7Z
* Samsung YP-U2JXB/W
* Palm OS devices using Pocket Tunes Deluxe software
* Archos 404
* Archos 504
* Archos 604
* Archos 604 Wifi
* Archos AV700
* Archos AV500
* Archos Gmini402
* Archos Gmini500
* All Windows Mobile devices running Windows Media Player 10
* Nokia N91
* TrekStor vibez
* Microsoft Zune (Though incompatible with any of the PlaysForSure stores.)
* Sandisk Sansa

References

External links

*, [http://www.google.com/patents?vid=USPAT7010808&id=iRx4AAAAEBAJ&dq=Windows+Media+DRM+for+Portable+Devices Google Patent]
* [http://www.mobile-review.com/articles/2006/nseries-openstudio-en.shtml Nokia N72]


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