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Hi. PhpDig can index almost any PDF that allows it, save for PDFs that take so much memory as to cause the script to barf due to lack of memory.
Whomever writes the PDF can set whether the copying of text from the PDF is allowed. I'm not sure about the dieing issue after trying to index an index protected PDF.
How many times do you find PhpDig trying to index an index protected PDF before it dies?
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