Document Library for iPhone Documents / Cache

Question

I developed one iOS application. For security reasons, I uploaded all the audio / video files to the Documents folder in the Library / Caches section .

To use iTunes, the end user cannot use this video backup. But some external programs easily open the Library / Cache> and download all the files from these folders.

My question is how to protect this Library / Cache folder or How to explicitly not store files in the document directory.

Answer 1

. NSDATA DRM ( )

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Answer 2

CoreData , , "Transformable" / . http://www.artandlogic.com/blog/2012/07/securing-your-core-data-with-transformable-attributes/ . , CD- , ( - , , ). , .

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Answer 3

NSData writeToFile: options: error: NSDataWritingFileProtectionComplete, . - AES .