DVD-Ds, also referred to as disposable DVDs[1], are a type of digital video disc that is designed to be used for a maximum 48 hours after the containing package is opened.[2] After this time, the DVDs become unreadable to DVD players[1] because they contain a chemical that, after the set period of time, will cause a DVD player to display a "No Disc" message when inserted.[1] The medium in itself is copy protection neutral and does not require additional Digital Rights Management types of applications to be installed for the content to be accessible.[1] Some people also suspected that the coating did not react with sunlight or air, but rather with the laser of the DVD player.[3] The technology used for DVD-Ds is different from that for earlier disposable DVDs. The earlier discs were isolated from exposure to air. When the packaging was opened, a special coating on the disc started to decay due to a chemical reaction with the surrounding air. As the reaction progressed the disc surface changed its color and after a predetermined time it became unreadable. [4]
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