HlsEncryption 
    class HlsEncryption
An HTTP Live Streaming (HLS) encryption configuration.
Types
Properties
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                  A constant initialization vector for encryption (optional). When not specified the initialization vector will be periodically rotated.
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                  The encryption method to use.
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                  Interval (in seconds) between each encryption key rotation.
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                  When enabled, the EXT-X-KEY tag will be repeated in output manifests.
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                  A configuration for accessing an external Secure Packager and Encoder Key Exchange (SPEKE) service that will provide encryption keys.