2 нояб. 2009 г. · 8 Answers 8 · click on File options (3 vertical line ellipsis) · click on Properties... · look for Created / Modified fields in the Properties ...

9 февр. 2021 г. · Adobe says that there is no way of detecting whether a pdf has been modified unless it is signed. https://community.adobe.com/t5 ...

26 авг. 2020 г. · How to check if PDF has been modified before applying signature - pdfbox · 2. Hash the file going out and rehash the file coming in. · @Jason ...

16 июн. 2013 г. · Given a PDF file. Can I find out which software/libraries (e.g. PDFBox, Adobe Acrobat, iText...) where used to created/edit it?

24 июн. 2010 г. · I check Header PDF like this: public bool IsPDFHeader(string fileName) { byte[] buffer = null; FileStream fs = new FileStream(fileName, ...

16 мая 2017 г. · 1 Answer 1 ... No perfect answer, but a strategy to make a decision: try (PDDocument document = PDDocument.load(new File(infile), password)) { for ...

16 мар. 2012 г. · A very simple way is to search for the text string <</AcroForm in the file: <?php $s = file_get_contents("test.pdf"); $has_form ...

16 апр. 2019 г. · The below code will work to extract data text data from both searchable and non-searchable PDF's.

31 мая 2011 г. · -1: Open a hex editor and see the header of a PDF. Not hard. Answer: %PDF is the 1st 4 bytes. – leppie. Commented May 31, 2011 at ...

17 февр. 2009 г. · The current solution (as of 2023) is to use pypdf and catch exceptions (and possibly analyze reader.metadata ) from pypdf import PdfReader ...