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MagicGate (MG) is a copy-protection technology introduced by Sony in 1999 as part of the Secure Digital Music Initiative (SDMI).[1][2] It works by encrypting the content on the device and using MagicGate chips in both the storage device and the reader to enforce control over how files are copied.[3]
MagicGate encryption was introduced with Sony's first digital audio players, with the related OpenMG technology being its software counterpart.[4] Since then, the encryption has been rolled out to other Sony devices – it is used in the memory cards of the PlayStation 2 and, as of 2004[update], has been introduced into all of Sony's Memory Stick products. Some devices will only accept Memory Sticks which use MagicGate technology.[5]
All Memory Stick Duo cards equipped with MagicGate can be identified by a notch located on the rear end of the card.