Digital rights management: Difference between revisions
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→Further reading: Start of an organized list of DRM, we should consider a dedicated list article though |
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==DRM in video content== | ==DRM in video content== | ||
Attempting to prevent the copying of video content is one of the most common and long-standing uses of DRM. The idea of using copy obstruction on video content predates the term "DRM", one early example being the "Automatic Gain Control" requirement in VCRs used to enforce the "Macrovision" copy-protection scheme.<ref>{{Cite web |date=1999-11-29 |title=17 U.S. Code § 1201 - Circumvention of copyright protection systems |url=https://www.law.cornell.edu/uscode/text/17/1201#k_1_A |url-status=live |archive-url=https://web.archive.org/web/20260201101756/https://www.law.cornell.edu/uscode/text/17/1201#k_1_A |archive-date=2026-02-01 |access-date=2026-02-06 |website=Cornell Law School}}</ref><ref>{{Cite web |date=2018 |title=Macrovision Demystified |url=https://cs.stanford.edu/people/eroberts/courses/cs181/projects/1999-00/dmca-2k/macrovision.html |url-status=live |archive-url=https://web.archive.org/web/20251212001352/https://cs.stanford.edu/people/eroberts/courses/cs181/projects/1999-00/dmca-2k/macrovision.html |archive-date=2025-12-12 |access-date=2026-02-06 |website=Stanford Engineering Computer Science}} </ref> | Attempting to prevent the copying of video content is one of the most common and long-standing uses of DRM. The idea of using copy obstruction on video content predates the term "DRM", one early example being the "Automatic Gain Control" requirement in VCRs used to enforce the "Macrovision" copy-protection scheme.<ref>{{Cite web |date=1999-11-29 |title=17 U.S. Code § 1201 - Circumvention of copyright protection systems |url=https://www.law.cornell.edu/uscode/text/17/1201#k_1_A |url-status=live |archive-url=https://web.archive.org/web/20260201101756/https://www.law.cornell.edu/uscode/text/17/1201#k_1_A |archive-date=2026-02-01 |access-date=2026-02-06 |website=Cornell Law School}}</ref><ref>{{Cite web |date=2018 |title=Macrovision Demystified |url=https://cs.stanford.edu/people/eroberts/courses/cs181/projects/1999-00/dmca-2k/macrovision.html |url-status=live |archive-url=https://web.archive.org/web/20251212001352/https://cs.stanford.edu/people/eroberts/courses/cs181/projects/1999-00/dmca-2k/macrovision.html |archive-date=2025-12-12 |access-date=2026-02-06 |website=Stanford Engineering Computer Science}} </ref> | ||
Formally known as "Analog Copy Protection", the scheme worked by encoding specific control signals into the output signal that corrupted the video. <ref name="hackaday_article"> | |||
{{Cite web | |||
| last = Maloney | |||
| first = Dan | |||
| date = 2018-05-27 | |||
| title = Rolling Old School With Copy Protection From The 1980s | |||
| url = https://hackaday.com/2018/05/27/rolling-old-school-with-copy-protection-from-the-1980s/ | |||
| access-date = 2026-03-19 | |||
| archive-url = https://ghostarchive.org/archive/wa2zi | |||
| archive-date = 2026-03-19 | |||
}} | |||
</ref> | |||
These signals were generally ignored by TVs, so when the VHS tape was played back, the video appeared correct, but VCRs handled these bogus signals, causing the recorded tape to contain the corrupted video. <ref name="hackaday_article" /> | |||
From 1996, DVDs began to feature the "Content Scramble System" (CSS), an encryption based DRM. CSS was successfully circumvented as early as 1999, less than five years after its introduction, partly due to the limited length of the 40-bit encryption key, which was used to comply with US government export regulations of the time.<ref>{{Cite web |last=Stevenson |first=Frank Andrew |date=27 Oct 1999 |title=[Livid-dev] Successfull attack on CSS algorithm |url=https://www.cs.cmu.edu/~dst/DeCSS/FrankStevenson/mail1.txt |url-status=live |archive-url=https://web.archive.org/web/20260114031245/https://www.cs.cmu.edu/~dst/DeCSS/FrankStevenson/mail1.txt |archive-date=2026-01-14 |access-date=2026-02-06 |website=Carnegie Mellon University School of Computer Science}}</ref><ref>{{Cite web |last=Stevenson |first=Frank A. |date=8 November 1999 |title=Cryptanalysis of Contents Scrambling System |url=http://www.dvd-copy.com/news/cryptanalysis_of_contents_scrambling_system.htm |url-status=dead |archive-url=https://web.archive.org/web/20000302000206/http://www.dvd-copy.com/news/cryptanalysis_of_contents_scrambling_system.htm |archive-date=2000-03-02 |access-date=2026-02-06 |website=DVD-Copy}}</ref> Following this, DVDs as well as HD-DVDs and Blu-Rays would implement other types of DRM, one of them being the "Advanced Access Content System".<ref>{{Cite web |title=Advanced Access Content System (AACS) |url=https://www.aacsla.com/specifications/specs091/AACS_Spec_Common_0.91.pdf |url-status=dead |archive-url=https://web.archive.org/web/20070302130221/http://www.aacsla.com/specifications/specs091/AACS_Spec_Common_0.91.pdf |archive-date=2 Mar 2007 |access-date=20 Apr 2025}} | From 1996, DVDs began to feature the "Content Scramble System" (CSS), an encryption based DRM. CSS was successfully circumvented as early as 1999, less than five years after its introduction, partly due to the limited length of the 40-bit encryption key, which was used to comply with US government export regulations of the time.<ref>{{Cite web |last=Stevenson |first=Frank Andrew |date=27 Oct 1999 |title=[Livid-dev] Successfull attack on CSS algorithm |url=https://www.cs.cmu.edu/~dst/DeCSS/FrankStevenson/mail1.txt |url-status=live |archive-url=https://web.archive.org/web/20260114031245/https://www.cs.cmu.edu/~dst/DeCSS/FrankStevenson/mail1.txt |archive-date=2026-01-14 |access-date=2026-02-06 |website=Carnegie Mellon University School of Computer Science}}</ref><ref>{{Cite web |last=Stevenson |first=Frank A. |date=8 November 1999 |title=Cryptanalysis of Contents Scrambling System |url=http://www.dvd-copy.com/news/cryptanalysis_of_contents_scrambling_system.htm |url-status=dead |archive-url=https://web.archive.org/web/20000302000206/http://www.dvd-copy.com/news/cryptanalysis_of_contents_scrambling_system.htm |archive-date=2000-03-02 |access-date=2026-02-06 |website=DVD-Copy}}</ref> Following this, DVDs as well as HD-DVDs and Blu-Rays would implement other types of DRM, one of them being the "Advanced Access Content System".<ref>{{Cite web |title=Advanced Access Content System (AACS) |url=https://www.aacsla.com/specifications/specs091/AACS_Spec_Common_0.91.pdf |url-status=dead |archive-url=https://web.archive.org/web/20070302130221/http://www.aacsla.com/specifications/specs091/AACS_Spec_Common_0.91.pdf |archive-date=2 Mar 2007 |access-date=20 Apr 2025}} | ||
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===Always-online DRM=== | ===Always-online DRM=== | ||
Some DRM requires a constant internet connection. While this may make sense in something that inherently requires an internet connection such as a streaming service or multiplayer-only video game, this has also been employed in games with single-player content, rendering customers unable to use their purchase if they do not have an active internet connection.<ref>{{Cite web |last=Kain |first=Erik |date=17 May 2012 |title='Diablo III' Fans Should Stay Angry About Always-Online DRM |url=https://www.forbes.com/sites/erikkain/2012/05/17/diablo-iii-fans-should-stay-angry-about-always-online-drm/ |url-status=live |archive-url=https://web.archive.org/web/20251024065743/https://www.forbes.com/sites/erikkain/2012/05/17/diablo-iii-fans-should-stay-angry-about-always-online-drm/ |archive-date=2025-10-24 |access-date=20 Apr 2025 |website=Forbes}}</ref> Conversely, if operations for these services are shut down, | Some DRM requires a constant internet connection. While this may make sense in something that inherently requires an internet connection such as a streaming service or multiplayer-only video game, this has also been employed in games with single-player content, rendering customers unable to use their purchase if they do not have an active internet connection.<ref>{{Cite web |last=Kain |first=Erik |date=17 May 2012 |title='Diablo III' Fans Should Stay Angry About Always-Online DRM |url=https://www.forbes.com/sites/erikkain/2012/05/17/diablo-iii-fans-should-stay-angry-about-always-online-drm/ |url-status=live |archive-url=https://web.archive.org/web/20251024065743/https://www.forbes.com/sites/erikkain/2012/05/17/diablo-iii-fans-should-stay-angry-about-always-online-drm/ |archive-date=2025-10-24 |access-date=20 Apr 2025 |website=Forbes}}</ref> Conversely, if operations for these services are shut down, users, even those with legitimate copies of software and internet access, cannot run their games without resorting to hacking them first.<ref>{{Cite web |last=Vitor |first=João |date=12 Jul 2024 |title=Rewriting completely the GameSpy support from 2000 to 2004 using Reverse Engineering on EA and Bungie Games |url=https://keowu.re/posts/Rewriting-completely-the-GameSpy-support-from-2000-to-2004-using-Reverse-Engineering-on-EA-and-Bungie-Games/ |url-status=live |archive-url=https://web.archive.org/web/20251216155905/https://keowu.re/posts/Rewriting-completely-the-GameSpy-support-from-2000-to-2004-using-Reverse-Engineering-on-EA-and-Bungie-Games |archive-date=2025-12-16 |access-date=20 Apr 2025 |website=Keowu Blog's}}</ref><ref>{{Cite web |last=Burns |first=Chris |date=4 Apr 2014 |title=GameSpy Shuts Down May 31: Will Your Game Be Affected? |url=https://www.slashgear.com/gamespy-shuts-down-may-31-will-your-game-be-affected-04323788/ |url-status=live |archive-url=https://web.archive.org/web/20251024204157/https://www.slashgear.com/gamespy-shuts-down-may-31-will-your-game-be-affected-04323788/ |archive-date=2025-10-24 |access-date=20 Apr 2025 |website=SlashGear}}</ref> [[Ubisoft]] has historically been known for server shutdowns and transfers cutting off access to games for many players.<ref>{{Cite web |last=Sharkey |first=Mike |date=2012-02-08 |title=Ubisoft DRM Locks Out Paying Customers |url=https://pc.gamespy.com/articles/121/1218211p1.html |url-status=dead |archive-url=https://web.archive.org/web/20150906130332/http://pc.gamespy.com/articles/121/1218211p1.html |archive-date=2015-09-06 |access-date=20 Apr 2025 |website=IGN Entertainment}}</ref> Encrypted [[ATSC 3.0]] channels cannot be tuned to without a persistent internet connection.<ref>{{Cite web |last=Seidman |first=Lon |date=3 Sep 2023 |title=The ADTH Nextgen TV Box Shows Us Just How Bad ATSC 3.0 Encryption Will Be.. |url=https://blog.lon.tv/2023/09/03/the-adth-nextgen-tv-box-shows-us-just-how-bad-atsc-3-0-encrpytion-will-be/ |url-status=live |archive-url=https://web.archive.org/web/20251214005506/https://blog.lon.tv/2023/09/03/the-adth-nextgen-tv-box-shows-us-just-how-bad-atsc-3-0-encrpytion-will-be/ |archive-date=2025-12-14 |access-date=20 Apr 2025 |website=Lon.tv}}</ref> | ||
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==Further reading== | ==Further reading== | ||
*[[Automotive digital restrictions management]] | *[[Automotive digital restrictions management]] | ||
=== Types of DRM === | |||
==== Gaming ==== | |||
* [[Denuvo]] | |||
* [[SecuROM]] | |||
==== Other ==== | |||
* [[HP Dynamic Security]] | |||
==References== | ==References== | ||
<references /> | <references /> | ||
[[Category:Digital rights management]] | [[Category:Digital rights management]] | ||