Janus was the

codename A code name, call sign or cryptonym is a Code word (figure of speech), code word or name used, sometimes clandestinely, to refer to another name, word, project, or person. Code names are often used for military purposes, or in espionage. They may ...

of a version of

Windows Media DRM Windows Media DRM or WMDRM, is a Digital Rights Management service for the Windows Media platform. It is designed to provide delivery of audio or video content over an IP network to a PC or other playback device in such a way that the distributor ca ...

primarily for

portable Portable may refer to: General * Portable building, a manufactured structure that is built off site and moved in upon completion of site and utility work * Portable classroom, a temporary building installed on the grounds of a school to provide a ...

devices, whose marketing name was Windows Media DRM for Portable Devices (or in short form WMDRM-PD). It was introduced by

Microsoft Microsoft Corporation is an American multinational technology corporation producing computer software, consumer electronics, personal computers, and related services headquartered at the Microsoft Redmond campus located in Redmond, Washing ...

in 2004 for use on portable media devices which store and access content offline.

Napster To Go Napster, commonly known as “Napster 2.0”, was a music streaming service and digital music store, launched by Roxio in 2003 under the purchased name and trademarks of former free peer-to-peer file sharing software Napster in the aftermath ...

was the first

online music store A digital music store is a business that sells digital audio files of music recordings over the Internet. Customers gain ownership of a license to use the files, in contrast to a music streaming service, where they listen to recordings without ...

to require the Janus technology. Supporting Janus often implies that the device also makes use of

Media Transfer Protocol The Media Transfer Protocol (MTP) is an extension to the Picture Transfer Protocol (PTP) communications protocol that allows media files to be transferred automatically to and from portable devices. Whereas PTP was designed for downloading phot ...

(MTP). Janus initially required supporting devices to ''not'' support non-Microsoft audio formats such as Ogg

Vorbis Vorbis is a free and open-source software project headed by the Xiph.Org Foundation. The project produces an audio coding format and software reference encoder/decoder (codec) for lossy audio compression. Vorbis is most commonly used in conjun ...

, but this requirement was later removed.

Characteristics

To support Janus, devices must support: *

Secure time Secure may refer to: * Security, being protected against danger or loss(es) **Physical security, security measures that are designed to deny unauthorized access to facilities, equipment, and resources **Information security, defending information ...

License A license (or licence) is an official permission or permit to do, use, or own something (as well as the document of that permission or permit). A license is granted by a party (licensor) to another party (licensee) as an element of an agreeme ...

storage for content items * Meters All of these are supported by way of

challenge–response authentication In computer security, challenge–response authentication is a family of protocols in which one party presents a question ("challenge") and another party must provide a valid answer ("response") to be authenticated. The simplest example of a cha ...

commands.

Stores that required Janus on portable devices

Devices that used Janus

* Most

BlackBerry OS BlackBerry OS is a discontinued proprietary mobile operating system developed by Canadian company BlackBerry Limited for its BlackBerry line of smartphone handheld devices. The operating system provides multitasking and supports specialized i ...

devices * Audiovox SMT 5600 smartphone * Toshiba Gigabeat S * Cowon iAudio X5 (as of firmware 2.11b1) * Cowon iAudio U3 *

Creative Zen ZEN is a series of discontinued portable media players designed and manufactured by Creative Technology Limited. The players evolved from the NOMAD brand through the NOMAD Jukebox series of music players, with the first separate "ZEN" branded mo ...

portable players (except Stone and Stone Plus) *

Dell DJ The Dell Digital Jukebox or just Dell DJ is a brand name for a series of digital audio players sold by the Dell corporation. Production The Dell DJs were engineered by Creative Technology and based on the same hardware and software platform as t ...

20GB (Gen 2) *

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 Palm OS (also known as Garnet OS) was a mobile operating system initially developed by Palm, Inc., for personal digital assistants (PDAs) in 1996. Palm OS was designed for ease of use with a touchscreen-based graphical user interface. It is provi ...

devices running Pocket Tunes Deluxe software *

Archos Archos (, stylized as ARCHOS) is a French Multinational corporation, multinational consumer electronics, electronics company that was established in 1988 by Henri Crohas. Archos manufactures tablet computers, tablets, smartphones, portable media ...

404 *

504 *

604 *

604 Wi-Fi *

AV700 *

AV500 *

Gmini402 *

Gmini500 * All

Windows Mobile Windows Mobile is a discontinued family of mobile operating systems developed by Microsoft for smartphones and personal digital assistants. Its origin dated back to Windows CE in 1996, though Windows Mobile itself first appeared in 2000 as Pock ...

devices running

Windows Media Player Windows Media Player (WMP) is the first media player and media library application that was developed by Microsoft for playing audio, video and viewing images on personal computers running the Microsoft Windows operating system, as well as on ...

10 *

Nokia Nokia Corporation (natively Nokia Oyj, referred to as Nokia) is a Finnish multinational corporation, multinational telecommunications industry, telecommunications, technology company, information technology, and consumer electronics corporatio ...

N72 *

N91 *

TrekStor vibez The TrekStor Vibez is a microdrive digital audio player released on November 15, 2006. It is available in 8 GB and 12 GB capacities. Flash versions of the Vibez player with 4 and 8 GB capacity were announced in 2007, but did not materialize for ...

* Microsoft

Zune Zune is a discontinued line of digital media products and services marketed by Microsoft from November 2006 until its discontinuation in June 2012. Zune consisted of a line of portable media players, digital media player software for Windows Per ...

(though incompatible with the

PlaysForSure Microsoft PlaysForSure was a certification given by Microsoft to portable devices and content services that had been tested against several hundred compatibility and performance requirements. These requirements include codec support, Digital ri ...

stores) *

Sandisk Sansa SanDisk has produced a number of flash memory-based digital audio and portable media players since 2005. The current range of products bear the SanDisk Clip name, a line of ultraportable digital audio players. SanDisk players were formerly market ...

* Popcorn Hour C-200 * All

Roku Roku ( ) is a brand of hardware digital media players manufactured by American company Roku, Inc. They offer access to streaming media content from online services. The first Roku model, developed in collaboration with Netflix, was introduce ...

DVP devices

References

External links

*
Nokia N72
{{DEFAULTSORT:Janus (Drm) Digital rights management systems Microsoft Windows multimedia technology