DRM and technologies

DRM and film
An early example of a DRM system was the Content Scrambling System (CSS) employed by the DVD Forum on film DVDs since circa 1996. CSS used a simple encryption algorithm, and required device manufacturers to sign license agreements that restricted the inclusion of features, such as digital outputs that could be used to extract high-quality digital copies of the film, in their players. Thus, the only consumer hardware capable of decoding DVD films was controlled, albeit indirectly, by the DVD Forum, restricting the use of DVD media on other systems until the release of DeCSS by Jon Lech Johansen in 1999, which allowed a CSS-encrypted DVD to play properly on a computer using Linux, for which the Alliance had not arranged a licensed version of the CSS playing software.
Microsoft's Windows Vista contains a DRM system called the Protected Media Path, which contains the Protected Video Path (PVP). PVP tries to stop DRM-restricted content from playing while unsigned software is running in order to prevent the unsigned software from accessing the content. Additionally, PVP can encrypt information during transmission to the monitor or the graphics card, which makes it more difficult to make unauthorized recordings.
Advanced Access Content System (AACS) is a DRM system for HD DVD and Blu-Ray Discs developed by the AACS Licensing Administrator, LLC (AACS LA), a consortium that includes Disney, Intel, Microsoft, Matsushita (Panasonic), Warner Brothers, IBM, Toshiba and Sony. In January 2007 a process key was published on the internet by crackers, enabling unrestricted access to AACS-restricted HD DVD content[citation needed].
The Broadcast Flag requires that all HDTVs obey what Hollywood commands as far as determining whether or not a data stream is allowed to be recorded. This would block legitimate uses, such as recording a television show and then burning it onto a DVD.

DRM and music

Audio CDs
In 2002, Bertelsmann (comprising BMG, Arista, and RCA) was the first corporation to use DRM on audio CDs. This was initially done on promotional CDs, but all CDs from these companies would eventually include at least some DRM.[citation needed]
It should be noted that discs with DRM installed are not legitimate standards compliant Compact Discs (CDs) but rather CD-ROM media, therefore they all lack the CD logotype found on discs which follow the standard (known as Redbook).
However, these CDs could not be played on all CD players. Many consumers could also no longer play CDs they had purchased on their computers. PCs running Microsoft Windows would sometimes even crash when attempting to play the CDs.[citation needed]
In 2005, Sony BMG introduced new DRM technology which installed DRM software on user's computers, without clearly notifying the user or requiring their confirmation. Among other things, the installed software included a rootkit, which created a severe security vulnerability others could exploit. When the nature of the DRM involved was made public much later, Sony initially minimized the significance of the vulnerabilities its software had created, but was eventually compelled to recall millions of CDs, and released several attempts to patch the surreptitiously included software to at least remove the rootkit. Several class action lawsuits were filed, which were ultimately settled by agreements to provide affected consumers with a cash payout or album downloads free of DRM.
Sony's DRM software actually had only a limited ability to prevent copying, as it affected only playback on Windows computers, not on other equipment. Even on the Windows platform, users regularly bypassed the restrictions. And, while the Sony DRM technology created fundamental vulnerabilities in customers' computers, parts of it could be trivially bypassed by holding down the "shift" key while inserting the CD, or by disabling the autorun feature. In addition, audio tracks could simply be played and re-recorded, thus completely bypassing all of the DRM (this is known as the analog hole). Sony's first two attempts at releasing a patch which would remove the DRM software from users' computers failed.
In January 2007, EMI stopped publishing audio CDs with DRM, stating that "the costs of DRM do not measure up to the results." EMI was the last publisher to do so, and audio CDs containing DRM are no longer released by any major publishers.

Internet music
Many online music stores employ DRM to restrict usage of music purchased and downloaded online. There are many options for consumers buying digital music over the internet, in terms of both stores and purchase options.
The iTunes Store, run by Apple Inc., allows users to purchase a track online for $.99 US. The tracks purchased use Apple's FairPlay DRM system. Starting on October 17, 2007, users can download DRM-free music for the same price as file with DRM.
Napster music store, which offers a subscription-based approach to DRM alongside permanent purchases. Users of the subscription service can download and stream an unlimited amount of music encoded to Windows Media Audio (WMA) while subscribed to the service. But as soon as the user misses a payment, the service renders all of the downloaded music unusable. Napster also charges users who wish to use the music on their portable device an additional $5 per month. Furthermore, Napster requires users to pay an additional $0.99 per track to burn it to CD or listen to it after the subscription expires. Songs bought through Napster can be played on players carrying the Microsoft PlaysForSure logo (which, notably, do not include iPods or even Microsoft's own Zune).
Wal-Mart Music Downloads, another online music download store, also uses DRM. It charges $0.88 per track for all non-sale downloads. All Wal-Mart Music Downloads are able to be played on any Windows PlaysForSure marked product. The music does play on the SanDisk's Sansa mp3 player, for example, but must be copied to the player's internal memory. It can not be played through the player's Micro SD card slot, which is a problem that many users of the mp3 player experience.
Sony operate an online music download service called "Connect" which uses Sony's proprietary OpenMG DRM technology. Music downloaded from this store (usually via Sony's SonicStage software) is only playable on computers running Windows and Sony hardware (including the PSP).
The various services are currently not interoperable, though those that use the same DRM system (for instance the several Windows Media DRM format stores, including Napster) all provide songs that can be played side-by-side through the same player program. Almost all stores require client software of some sort to be downloaded, and some also need plug-ins. Several colleges and universities, such as Rensselaer Polytechnic Institute, have made arrangements with assorted Internet music suppliers to provide access (typically DRM-restricted) to music files for their students, to less than universal popularity, sometimes making payments from student activity fee funds.One of the problems is that the music becomes unplayable after leaving school unless the student continues to pay individually. Another is that few of these vendors are compatible with the most common portable music player, the Apple iPod. The Gowers Review of Intellectual Property (to HMG in the UK; 141 pages, 40+ specific recommendations) has taken note of the incompatibilities, and suggests (Recommendations 8 -- 12) that there be explicit fair dealing exceptions to copyright allowing libraries to copy and format-shift between DRM schemes, and further allowing end users to do the same privately. If adopted, some of the acrimony may decrease.
Although DRM is prevalent for Internet music, some Online music stores such as eMusic, Audio Lunchbox, www.dogmazic.net, www.amazon.com and Anthology recordings do not use DRM. Major labels have begun releasing more online music without DRM. Eric Bangeman suggests in Ars Technica that this is because the record labels are "slowly beginning to realize that they can't have DRMed music and complete control over the online music market at the same time... One way to break the cycle is to sell music that is playable on any digital audio player. eMusic does exactly that, and their surprisingly extensive catalog of non-DRMed music has vaulted it into the number two online music store position behind the iTunes Store."Apple's Steve Jobs has called on the music industry to eliminate DRM in an open letter titled Thoughts on Music. Apple's iTunes store will start to sell DRM-free 256 kbit/s (up from 128 kbit/s) music from EMI for a premium price (this has since reverted to the standard price). In March of 2007, Musicload.de, one of Europe's largest online music retailers, announced their position strongly against DRM. In an open letter, Musicload stated that three out of every four calls to their customer support phone service are as a result of consumer frustration with DRM.

DRM and documents
Enterprise digital rights management (E-DRM or ERM) is the application of DRM technology to the control of access to corporate documents such as Microsoft Word, PDF, and AutoCAD files, emails, and intranet web pages rather than to the control of consumer media [12]. E-DRM is generally intended to prevent the unauthorized use (such as industrial or corporate espionage or inadvertent release) of proprietary documents. E-DRM typically integrates with content management system software. An example of an E-DRM system is Microsoft's Rights Management Services. Additional E-DRM vendors include Adobe Systems, GigaTrust, Oracle, and EMC Corporation.
DRM has been used by organizations such as the British Library in its secure electronic delivery service to permit worldwide access to substantial numbers of rare (and in many cases unique) documents which, for legal reasons, were previously only available to authorized individuals actually visiting the Library's document centre at Boston Spa in England.[citation needed]

Watermarks
Digital watermarks are unobtrusive features of media that are added during production or distribution. Digital watermarks involve data steganographically embedded within the audio or video data.
Watermarks can be used for different purposes that may include:
for recording the copyright owner
for recording the distributor
for recording the distribution chain
for identifying the purchaser of the music
Watermarks are not complete DRM mechanisms in their own right, but are used as part of a system for Digital Rights Management, such as helping provide prosecution evidence for purely legal avenues of rights management, rather than direct technological restriction.

Metadata
Sometimes, metadata is included in purchased music which records information such as the purchaser's name, account information, or email address. This information is not embedded in the actual audio or video data, like a watermark.
As an example, metadata is used in media purchased from Apple's iTunes Store for DRM-free as well as DRM-restricted versions of their music or videos. This information is included as MPEG standard metadata.