| 摘要 |
Various quality versions of an electronic content are defined, and one or more distortion algorithms ( 22, 32 ) that are executable to generate a lower quality version of the electronic content by a distortion of the highest quality version ( 21, 31 ) are defined. Each quality version is selectively assigned a content key (CK) whereby an electronic content player ( 34, 70 ) will have the appropriate information when decrypting, decoding, and/or distorting the highest quality version ( 21, 31 ) of the electronic content.
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