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).
Janus initially required supporting devices to not support non-Microsoft audio formats such as Ogg Vorbis, but this requirement has since been rescinded.
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.
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 onboard radio is lost if firmware is upgraded)
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
Popcorn Hour C-200
All Roku DVP Devices
