objective c - Cocoa PDFKit Unlocking Encrypted Files -

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I have a PDF document in which the owner is set password but there is no user password so it is encrypted.

I want to know the owner's password and use PDFKit to confirm when the document has been decrypted.

When I use the PDFDocument unlockWithPassword method which is the answer yes the file is unlocked although this method also gives yes when the file is unlocked by a user password and not the owner password.

The unlockWithPassword method does not appear to be the state of the isEncrpyted method which I tried to use to define decryption to change.

I want the file decrpyt so that I can use the method of writing, there is no security to write a new file. At the moment, when calling this method on document object results, call in a file with zero length. I think this is due to the encryption.

I'm going about this in the right way or I should use a different way to decrypt the pdf file.

Once you unlock the PDF, you have to write it back to a file using it Required: 

  writeToFile: withOptions:

or 

  writeToURL: withOptions:

Option being a nsDictionary .

According to Apple :. The most commonly used options are kCGPDFContextOwnerPassword, kCGPDFContextUserPassword, kCGPDFContextAllowsCopying and kCGPDFContextAllowsPrinting

"For more information about these options, helpful dictionary key CGPDFContext reference In, quartz 2D is part of the reference. "


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