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.
--protection_systems
	Protection systems to be generated. Supported protection systems include Widevine, PlayReady, FairPlay, Marlin, and CommonSystem (https://goo.gl/s8RIhr).