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|1. (WO2018138724) ASYMMETRIC CONTENT PROTECTION OF LARGE DATASTREAMS|
|Applicants:||SIX DEGREES SPACE LTD
|Title:||ASYMMETRIC CONTENT PROTECTION OF LARGE DATASTREAMS|
A content protection system includes an encrypter to encrypt fragments of a datastream, each with one of a multiplicity of related encryption keys, so as to require a decrypter to use limited exhaustive key searches to determine the corresponding decryption keys. The encrypter includes a key generator to generate the encryption keys and an individual key encrypter to encrypt each the fragment with its associated encryption key. Each encryption key is a function of a disclosed key and an additional random parameter. A content presentation system includes a fragment selector and a key deriver. The fragment selector selects a fragment of a datastream to present to a user based on a user selection. The key deriver finds the value of the additional random parameter to determine the individual key for decrypting the selected fragment.