Module Pdfcrypt

module Pdfcrypt: sig .. end

40-bit, 128-bit and AES Decryption

Note that encryption depends on fixed object and generation numbers: don't change these (for example by calling Pdf.remove_unreferenced on the PDF) before writing.

Encryption support is part of the Pdfwrite module.

type permission =

`\|`	`NoEdit`
`\|`	`NoPrint`
`\|`	`NoCopy`
`\|`	`NoAnnot`
`\|`	`NoForms`
`\|`	`NoExtract`
`\|`	`NoAssemble`
`\|`	`NoHqPrint`

val decrypt_pdf : string -> Pdf.pdfdoc -> Pdf.pdfdoc option * permission list

Decrypt a PDF document, given the user password, returning the permissions under which the document was encrypted.

val decrypt_pdf_owner : string -> Pdf.pdfdoc -> Pdf.pdfdoc option

Decrypt a PDF document, given the owner password.

val recrypt_pdf : Pdf.pdfdoc -> Pdf.pdfdoc -> string -> Pdf.pdfdoc

recrypt_pdf original decrypted_and_modified re-encrypts a PDF document which was decrypted using the user password and owner password from the original encrypted file and the same permissions and encryption parameters.