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I would like to know how Android, Windows, Linux, and OS X deal with DRM (Digital Rights Management) e-pub, pdf, and mp3 files. Basically, if I download a DRM file to my device (perhaps one that has an expiry date or forbids copying of the file), can't anyone write a custom (despite illegal in most countries, or perhaps even one for personal use written by a coder who knows enough about DRM) program to ignore the DRM portions of the file and turn it into a regular non-DRM file?

closed as too broad by Deer Hunter, RoraΖ, BadSkillz, TildalWave, John Deters Feb 5 '16 at 20:00

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As long as any program capable of reading the DRM protected file is working on your computer, experts can analyze it and write a program that circumvents DRM for that file for an indefinite amount of time.

There are DRM systems in which the key to decrypt the content is calculated just-in-time by a server. If you didn't save the key before expiration, you likely can't access this file with any software after expiration.

  • Thanks. Is this how DRM in e-pub and pdf files from sites like Google Play works? Thanks. – Jack Maddington Feb 6 '16 at 18:27

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