add recommendation to use the 1+9 pattern #110
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Would this reduce validation tests at all? If all other patterns are optional (MAY) then presumably they still have to be tested? |
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We would recommend the following text: "When the protected scheme cbcs is used, samples SHALL be protected using subsample encryption and SHALL use pattern encryption. [CENC] recommends that the Pattern Block length be 10, i.e. crypt_byte_block + skip_byte_block = 10. The combination [crypt_byte_block:skip_byte_block] SHALL be from the set {[1:9], [5:5], [10:0]}. The combination [1:9] SHOULD be used." |
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This PR addresses a comment made in #109. This is an initial proposal to recommend the use of 1+9 over other patterns.