shaka-packager/docs/source/options/general_encryption_options.rst

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General encryption options
^^^^^^^^^^^^^^^^^^^^^^^^^^
--protection_scheme <scheme>
Specify a protection scheme, 'cenc' or 'cbc1' or pattern-based protection
schemes 'cens' or 'cbcs'.
--vp9_subsample_encryption, --novp9_subsample_encryption
Enable / disable VP9 subsample encryption. Enabled by default.
--clear_lead <seconds>
Clear lead in seconds if encryption is enabled.
Shaka Packager does not support partial encrypted segments, all the
segments including the partial segment overlapping with the initial
'clear_lead' seconds are not encrypted, with all the following segments
encrypted. If segment_duration is greater than 'clear_lead', then only the
first segment is not encrypted.
Default: 5
--protection_systems
Protection systems to be generated. Supported protection systems include
Widevine, PlayReady, FairPlay, Marlin, and
`CommonSystem <https://goo.gl/s8RIhr>`_.