Janus (DRM)
Encyclopedia
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, but this requirement has since been rescinded.
All these are supported by way of challenge-response authentication
commands.
Windows Media DRM
Windows Media DRM is a Digital Rights Management service for the Windows Media platform. It is designed to provide delivery of audio and/or video content over an IP network to a PC or other playback device in such a way that the distributor can control how that content is used.WMDRM includes the...
for portable
Portable
Portable may refer to:* Portable building, a manufactured structure that is built off site and moved in upon completion of site and utility work...
devices, whose marketing name is Windows Media DRM for Portable Devices (or in short form WMDRM-PD) introduced by Microsoft
Microsoft
Microsoft Corporation is an American public multinational corporation headquartered in Redmond, Washington, USA that develops, manufactures, licenses, and supports a wide range of products and services predominantly related to computing through its various product divisions...
in 2004 for use on portable media devices which store and access content offline. Napster To Go was the first online music store
Online music store
An online music store is an online business which sells audio files, usually music, on a per-song and/or subscription basis. It may be differentiated from music streaming services in that the music store offers the actual music file, while streaming services offer partial or full listening without...
to require the Janus technology. Supporting Janus often implies that the device also make use of the Media Transfer Protocol
Media Transfer Protocol
The Media Transfer Protocol is a devised set of custom extensions to the Picture Transfer Protocol . Whereas PTP was designed for downloading photographs from digital cameras, Media Transfer Protocol supports the transfer of music files on digital audio players and media files on portable media...
(MTP).
Janus initially required supporting devices to not support non-Microsoft audio formats such as Ogg Vorbis
Vorbis
Vorbis is a free software / open source project headed by the Xiph.Org Foundation . The project produces an audio format specification and software implementation for lossy audio compression...
, but this requirement has since been rescinded.
Characteristics
To support Janus devices must support:- Secure time
- LicenseLicenseThe verb license or grant licence means to give permission. The noun license or licence refers to that permission as well as to the document recording that permission.A license may be granted by a party to another party as an element of an agreement...
storage for content items - Meters
All these are supported by way of challenge-response authentication
Challenge-response authentication
In computer security, challenge-response authentication is a family of protocols in which one party presents a question and another party must provide a valid answer to be authenticated....
commands.
Stores that require Janus on portable devices
Portable devices that use Janus
- Audiovox SMT 5600 Smartphone
- Toshiba GigabeatGigabeatThe Gigabeat is a line of digital audio players by Toshiba.-Gigabeat:The Gigabeat was first called the MobilPhile and later renamed to Gigabeat. It contained a monochrome LCD with blue backlighting, and a 5 GB removable PCMCIA hard drive. Its case was made of aluminum, and battery life is...
S - Cowon iAudioIAUDIOiAUDIO is a brand of portable digital audio players produced by Korean consumer electronics manufacturer Cowon Systems. -Cowon S9:The Cowon S9 was released in December 2008. It comes in 4, 8, 16, and 32 GB storage sizes. The S9 features a 3.3″ AMOLED touchscreen and is capable of viewing DivX,...
X5 (as of firmware 2.11b1) - Cowon iAudioIAUDIOiAUDIO is a brand of portable digital audio players produced by Korean consumer electronics manufacturer Cowon Systems. -Cowon S9:The Cowon S9 was released in December 2008. It comes in 4, 8, 16, and 32 GB storage sizes. The S9 features a 3.3″ AMOLED touchscreen and is capable of viewing DivX,...
U3 - All Creative ZenCreative ZenThe Creative ZEN is a range of digital audio players and portable media players made by Creative Technology. The players evolved from the now-defunct NOMAD brand through the NOMAD Jukebox series...
portable players (except the Creative Zen Stone and Stone Plus) - Dell DJDell Digital JukeboxThe Dell Digital Jukebox or just Dell DJ was a brand name for a series of digital audio players sold by the Dell Computer corporation....
20GB (Gen 2) - Dell DJDell Digital JukeboxThe Dell Digital Jukebox or just Dell DJ was a brand name for a series of digital audio players sold by the Dell Computer corporation....
30GB - Dell Pocket DJDell Digital JukeboxThe Dell Digital Jukebox or just Dell DJ was a brand name for a series of digital audio players sold by the Dell Computer corporation....
- iriverIriveririver is a consumer electronics company headquartered in South Korea and widely known for its digital audio players and other portable media devices....
Clix - iriver H10 seriesIriver H10 seriesThe iriver H10 is a series of portable digital audio players made by iriver, coming in multiple capacities and sizes. The series uses the PortalPlayer 5020 CPU. Every version of the series has a color screen....
(with MTP firmware only) - iriverIriveririver is a consumer electronics company headquartered in South Korea and widely known for its digital audio players and other portable media devices....
H320 (US version only, after upgrading to EU/KR/JP firmware DRM capabilities are lost) - iriverIriveririver is a consumer electronics company headquartered in South Korea and widely known for its digital audio players and other portable media devices....
H340 (US version only, after upgrading to EU/KR/JP firmware DRM capabilities are lost) - iriverIriveririver is a consumer electronics company headquartered in South Korea and widely known for its digital audio players and other portable media devices....
PMC-120 (Portable Media Center) - Samsung YH-925YeppYepp is Samsung Electronics' digital audio player brand. The brand includes a wide range of hard-drive based as well as flash-memory based players...
(Not Australian or European version as you lose onboard radio if you upgrade the firmware) - Samsung YH-999YeppYepp is Samsung Electronics' digital audio player brand. The brand includes a wide range of hard-drive based as well as flash-memory based players...
Portable Media Center - Samsung YP-T7ZYeppYepp is Samsung Electronics' digital audio player brand. The brand includes a wide range of hard-drive based as well as flash-memory based players...
- Samsung YP-U2JXB/WYeppYepp is Samsung Electronics' digital audio player brand. The brand includes a wide range of hard-drive based as well as flash-memory based players...
- Palm OSPalm OSPalm OS is a mobile operating system initially developed by Palm, Inc., for personal digital assistants in 1996. Palm OS is designed for ease of use with a touchscreen-based graphical user interface. It is provided with a suite of basic applications for personal information management...
devices using Pocket Tunes Deluxe software - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
404 - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
504 - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
604 - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
604 Wifi - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
AV700 - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
AV500 - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
Gmini402 - ArchosArchosArchos is a French consumer electronics company that was established in 1988 by Henri Crohas. Archos manufactures portable media players and portable data storage devices. The name is an anagram of Crohas' last name, and it is also Greek for 'master'...
Gmini500 - All Windows MobileWindows MobileWindows Mobile is a mobile operating system developed by Microsoft that was used in smartphones and Pocket PCs, but by 2011 was rarely supplied on new phones. The last version is "Windows Mobile 6.5.5"; it is superseded by Windows Phone, which does not run Windows Mobile software.Windows Mobile is...
devices running Windows Media PlayerWindows Media PlayerWindows Media Player is a media player and media library application developed by Microsoft that is used for playing audio, video and viewing images on personal computers running the Microsoft Windows operating system, as well as on Pocket PC and Windows Mobile-based devices...
10 - NokiaNokiaNokia Corporation is a Finnish multinational communications corporation that is headquartered in Keilaniemi, Espoo, a city neighbouring Finland's capital Helsinki...
N91 - TrekStorTrekStorTrekStor GmbH & Co. KG is a German manufacturer of portable storage products and audio devices incorporated in 2004 and located in Lorsch in South Hesse, Germany.The company is primarily known for its MP3 players, hard disk drives, and USB flash drives...
vibezTrekstor VibezThe TrekStor Vibez is a microdrive digital audio player released on November 15, 2006. It is currently available in 8 GB and 12 GB capacities.... - Microsoft ZuneZuneZune is a digital media brand owned by Microsoft which includes a line of portable media players, a digital media player software for Windows machines, a music subscription service known as a 'Zune Music Pass', music and video streaming for the Xbox 360 via the Zune Software, music, TV and movie...
(Though incompatible with any of the PlaysForSure stores.) - Sandisk SansaSanDisk SansaThe SanDisk Sansa is a line of 2 to 16 gigabyte flash memory-based digital audio players and portable media players produced by SanDisk.- Sansa Fuze+:...
- Popcorn Hour C-200
- All RokuRokuRoku , is an American, privately held, consumer electronics company that sells home digital media products. The Company is based in Saratoga, California.- Company profile and products :...
DVP Devices