How to determine if the contents of a .pdf file is checked or not.

Question

So, I have a .pdf file, and I need to determine if it was created by scanning to a PDF file or not. I am trying to determine if it is a pdf that I can display as text or not.

I have PHP and Zend at my disposal. I think I can use Zend

$pdf->properties['Producer']

but I'm not 100% sure.

Is there any way to make sure which .pdf file I have in mind?

Answer 1

. "", PDF , , - . PDF , , .

, , - ? ( ), . OCR, PDF , . ?

?

Answer 2

, PDF, Adobe Acrobat Reader.

, , , .

, , , .