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How can I extract the title from an encrypted (write protected, not password protected) PDF file using PHP on Linux? Usage of external libraries or binaries are OK. Zen_PDF did not work (Exception: Encrypted document modification is not supported) nor did libextract (title="filename of pdf.pdf")
If you’re using *nix, have you tried XPDF?
There is a blog post here about how someone has used it for a customer of their’s – whether it will be of any help I’m unsure.
EDIT: There seems to be some code here that could help – a simple class that reads a PDF into plaintext. Unsure if it supports decryption.
EDIT2: There are also a number of resources in PHP documentation that may help you. Click.
EDIT3: FPDF and FPDI may also help. Probably your best bet after some research.