Merge from widevine repo of http://go/wvgerrit/17877 The final spec for CENC says that partial encrypted blocks are only allowed for "cenc" mode, and not for "cens" mode. Also, the pattern_offset must be 0 for all calls to OEMCrypto_DecryptCENC. Review doc changes http://go/wvdelta11 and http://go/oemcrypto Notice that this CL affects documentation and test code only. No production code is affected. b/28718266 b/28817376 Change-Id: I1d6a38a763a2b693ea0c26bc909e1c721b8facaf
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