Historical Note
A very early implementation of DRM was the Software Service System (SSS) devised by the Japanese engineer Ryoichi Mori in 1983 and subsequently refined under the name superdistribution. The SSS was based on encryption, with specialized hardware that controlled decryption and also enabled payments to be sent to the copyright holder. The underlying principle of the SSS and subsequently of superdistribution was that the distribution of encrypted digital products should be completely unrestricted and that users of those products would not just be permitted to redistribute them but would actually be encouraged to do so.
Read more about this topic: Digital Rights Management
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