Static kCMSampleAttachmentKey_CryptorSubsampleAuxiliaryData 

pub unsafe static kCMSampleAttachmentKey_CryptorSubsampleAuxiliaryData: &'static CFString

Available on crate feature CMSampleBuffer only.

Describes the ranges of protected and unprotected data within a protected CMSampleBuffer

The attachment is CFData containing one or more “BytesOfClearData”/“BytesOfProtectedData” pairs as appears in the ‘senc’ box (see ISO/IEC 23001-7 section 7.2.2). The “BytesOfClearData” and the “BytesOfProtectedData” fields are 32-bit integers. Both are native endian in the CFData. This attachment is not present if the CMSampleBuffer contains unprotected content.

See also Apple’s documentation