Digital rights management

Digital rights management (DRM) is a class of access control technologies that are used by hardware manufacturers, publishers, copyright holders and individuals with the intent to limit the use of digital content and devices after sale. DRM is any technology that inhibits uses of digital content that are not desired or intended by the content provider. Copy protection which can be circumvented without modifying the file or device, such as serial numbers or keyfiles are not generally considered to be DRM. DRM also includes specific instances of digital works or devices. Companies such as Amazon, AT&T AOL, Apple Inc., the BBC, Microsoft, Electronic Arts and Sony use digital rights management. In 1998 the Digital Millennium Copyright Act (DMCA) was passed in the United States to impose criminal penalties on those who make available technologies whose primary purpose and function is to circumvent content protection technologies.^]

The use of digital rights management is controversial. Content providers claim that DRM is necessary to fight copyright infringement online and that it can help the copyright holder maintain artistic control or ensure continued revenue streams. Those opposed to DRM contend there is no evidence that DRM helps prevent copyright infringement, arguing instead that it serves only to inconvenience legitimate customers, and that DRM helps big business stifle innovation and competition. Further, works can become permanently inaccessible if the DRM scheme changes or if the service is discontinued. Proponents argue that digital locks should be considered necessary to prevent "intellectual property" from being copied freely, just as physical locks are needed to prevent personal property from being stolen.

 

SHORTCOMINGS OF DIGITAL RIGHTS MANAGEMENT

 

Methods to bypass DRM

There are many methods to bypass DRM control on audio and video content.

One simple method to bypass DRM on audio files is to burn the content to an audio CD and then rip it into DRM-free files.

Many software programs have been developed that intercept the data stream as it is decrypted out of the DRM-restricted file, and then use this data to construct a DRM-free file. These programs require a decryption key.

 Another method is to use software to record the signals being sent through the audio or video cards, or to plug analog recording devices into the analog outputs of the media player. These techniques utilize the so-called "analog hole" (see below).

Analog hole

All forms of DRM for audio and visual material (excluding interactive materials, e.g. videogames) are subject to the analog hole, namely that in order for a viewer to play the material, the digital signal must be turned into an analog signal containing light and/or sound for the viewer, and so available to be copied as no DRM is capable of controlling content in this form.

All DRM to date can therefore be bypassed by recording this signal and digitally storing and distributing it in a non DRM limited form, by anyone who has the technical means of recording the analog stream.. 

DRM on general computing platforms

Many of the DRM systems in use are designed to work on general purpose computing hardware, such as desktop PCs apparently because this equipment is felt to be a major contributor to revenue loss from disallowed copying.

Such schemes, especially software based ones, can never be wholly secure since the software must include all the information necessary to decrypt the content, such as the decryption keys. An attacker will be able to extract this information, directly decrypt and copy the content, which bypasses the restrictions imposed by a DRM system.

DRM on purpose-built hardware

Many DRM schemes use encrypted media which requires purpose-built hardware to hear or see the content. It tries to protect a secret decryption key from the users of the system.

While this in principle can work, it is extremely difficult to build the hardware to protect the secret key against a sufficiently determined adversary.. In addition user verification provisions are frequently subject to attack, pirate decryption being among the most frequented ones.

Watermarks

Watermarks can very typically be removed, although degradation of video or audio can occur.

Mass piracy failure

Mass piracy of hard copies does not necessarily need DRM to be decrypted or removed, as it can be achieved by bit-perfect copying of a legally obtained medium without accessing the decrypted content.

Obsolescence

When standards and formats change, it may be difficult to transfer DRM-restricted content to new media. Additionally, any system that requires contact with an authentication server is vulnerable to that server becoming unavailable, as happened in 2007 when videos purchased from Major League Baseball (mlb.com) prior to 2006 became unplayable due to a change to the servers that validate the licenses.

Amazon PDF and LIT eBooks - In August 2006, Amazon stopped selling DRMed PDF and .LIT format eBooks. Customers were unable to download purchased eBooks 30 days after that date, losing access to their purchased content on new devices.

Music Team notified its customers via email they will be shutting down their DRM servers October 9, 2008 and any DRM-encumbered music acquired from them will no longer be accessible unless ripped to a non-DRM format before that date.

After bad press and negative reaction from customers, on October 9, 2008, Walmart decided not to take its DRM servers offline. 

Ads for Adobe PDF - Also in January 2009, Adobe Systems announced that as of March 2009 they would no longer operate the servers that served ads to their PDF reader. Depending on the restriction settings used when PDF documents were created, they may no longer be readable.

Adobe Content Server 3 for Adobe PDF - In April 2009, Adobe Systems announced that as of March 30, 2009 the Adobe Content 3 server would no longer activate new installations of Adobe Reader or Adobe Acrobat. In addition, the ability to migrate content from Adobe Content Server 3 to Adobe Content Server 4 would cease from mid-December 2009. Anyone who failed to migrate their DRMed PDF files during this nine month window lost access to their content the next time they had to re-install their copy of Adobe Reader or Adobe Acrobat.

 

Moral and legitimacy implications

1.    One of the principles of the Rule of Law is that "The law can be readily determined and is stable enough to allow individuals to plan their affairs." 

2.    A problem with DRM that EFF points to is: ".. in an effort to attract customers, these music services try to obscure the restrictions they impose on you with clever marketing." 

3.    DRM laws are widely flouted: according to Australia Official Music Chart Survey, copyright infringements from all causes are practised by millions of people.