kCGPDFContextEncryptionKeyLength
Declaration
let kCGPDFContextEncryptionKeyLength: CFStringDiscussion
The encryption key length in bits; see Table 3.18 “Entries common to all encryption dictionaries”, PDF Reference: Adobe PDF version 1.5 (4th ed.) for more information. Optional; if present, the value of this key must be a CFNumber object with value which is a multiple of 8 between 40 and 128, inclusive. If this key is absent or invalid, the encryption key length defaults to 40 bits.