Magic Gate

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MagicGate is a copy-protection technology introduced by Sony in 1999 as part of the Secure Digital Music Initiative (SDMI). 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.

MagicGate encryption is used in the memory cards of the PlayStation 2 in 2000 and, as of 2004, has been introduced into all of Sony's Memory Stick products.

Source: https://en.wikipedia.org/wiki/MagicGate