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Windows Media DRM is a digital rights management service for the Windows Media platform. It is designed to provide secure delivery of audio and/or video content over a IP network, to a PC or device. Digital Rights Management (generally abbreviated to DRM) is any of several technologies used by publishers to control access to and usage of digital data (such as software, music, movies) and hardware, handling usage restrictions associated with a specific instance of a digital work. ...
Windows Media is a framework for media creation and distribution for Microsoft Windows. ...
WMDRM includes the following components:
- Windows Media Rights Manager (WMRM) SDK for packaging content and issuing licenses
- Windows Media Format SDK (WMF SDK) for building Windows applications which support DRM and the Windows Media format
- Windows Media DRM for Portable Devices (WMDRM-PD) for supporting offline playback on portable devices
- Windows Media DRM for Network Devices (WMDRM-ND) for streaming protected content to devices attached to a home network
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. ...
How it works
An analysis of an earlier version of the DRM scheme in Windows Media Audio revealed that it was using a combination of elliptic curve cryptography key exchange, DES block cipher, a custom block cipher, RC4 stream cipher and the SHA-1 hashing function. Elliptic curve cryptography (ECC) is an approach to public-key cryptography based on the algebraic structure of elliptic curves over finite fields. ...
General Designer(s) IBM First published 1975 (January 1977 as the standard) Derived from Lucifer (cipher) Cipher(s) based on this design Triple DES, G-DES, DES-X, LOKI89, ICE Algorithm detail Block size(s) 64 bits Key size(s) 56 bits Structure Feistel network Number of rounds 16 Best...
For the Vietnam road named RC4, see Route Coloniale 4. ...
The SHA (Secure Hash Algorithm) family is a set of related cryptographic hash functions designed by the National Security Agency (NSA) and published by the National Institute of Standards and Technology (NIST). ...
Windows Media DRM is designed to be renewable, that is, it is designed on the assumption that it will be cracked and must be constantly updated by Microsoft. The result is that while the scheme has been cracked several times, it has usually not remained cracked for long.
Version 1 was released in April 1999 and supported basic business rules such as expiration dates. Version 2 was released in January 2003 and is also known as version 7.x and 9, to keep in sync with the equivalent versions of Windows Media Player. Version 3, better known as DRM v10, was released in 2004. Earlier versions of the system have cracks available, meaning content protected with these versions can have the protections stripped. Version 10 was cracked in early 2005, but a software update was shortly pushed which sealed the relevant hole. Windows Media Player is a proprietary software digital media player and media library application developed by Microsoft that is used for playing audio, video and images on personal computers running the Microsoft Windows operating system, as well as on Pocket PC and Windows Mobile-based devices. ...
Generally, these sorts of cracks have all worked in the same way. Rather than break the encryption itself, which is practically uncomputable, they hook or interfere with the "black box" component as it runs to dump out the content keys or the unencrypted content from memory. These sorts of techniques are brittle and easily patched by Microsoft via Windows Update.
Interoperability The content delivered by the WMDRM encryption is limited to recipients running Windows OS.
Removal Tools have been created to to strip files of Windows Media DRM. For example, FairUse4WM, a program released on August 19, 2006[1], has the ability to strip DRM from files protected with WMDRM version 10 and 11.[2] However, Microsoft responded on August 28, 2006 that the hole will be fixed very soon.[1] August 19 is the 231st day of the year (232nd in leap years) in the Gregorian Calendar. ...
2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ...
August 28 is the 240th day of the year in the Gregorian Calendar (241st in leap years), with 125 days remaining. ...
2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ...
FairUse4WM was created by "viodentia" of the doom9 forum. It is a GUI front-end to drmdbg, a tool released originally in 2005 by "lark".[citation needed] For more information see the FairUse4WM topic-thread on doom9-net forums. Doom9 is a website featuring information on digital video encoding. ...
GUI can refer to the following: GUI is short for graphical user interface, a term used to describe a type of interface in computing. ...
References Wikiquote has a collection of quotations related to: Windows Media DRM Image File history File links Wikiquote-logo-en. ...
Wikiquote logo Wikiquote is a sister project of Wikipedia, using the same MediaWiki software. ...
2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ...
August 29 is the 241st day of the year in the Gregorian Calendar (242nd in leap years), with 124 days remaining. ...
2006 (MMVI) is a common year starting on Sunday of the Gregorian calendar. ...
August 25 is the 237th day of the year in the Gregorian Calendar (238th in leap years), with 128 days remaining. ...
See also 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. ...
Windows Media is a framework for media creation and distribution for Microsoft Windows. ...
External links - Microsoft Windows Media DRM home page
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