Hidden data in pdf files

Third-party metadata contained in PDF documents can reveal sensitive information about you, your clients, and the organization you work for. As an added bonus, third-party data removal also reduces PDF file sizes. PDFpen enables third-party metadata removal since version Combined with redaction and password protection, the ability to remove third-party metadata make PDFpen an even more effective tool for securing PDF files.

Skip to content. When people saved it as PDF, the text inside those cells disappeared. I now have only the PDF files. Is there a way to restore this information from the PDF files? If you uncompress a pdf and then compress it again without any modifications, do your images have different colors? I didn't notice a problem with the pdf I tried link. Add a comment. Active Oldest Votes. Improve this answer. David van Driessche David van Driessche 6, 2 2 gold badges 25 25 silver badges 39 39 bronze badges.

Ah, we could have a discussion about your point 4 though I liked it According to the PDF specification: "The body of a PDF file shall consist of a sequence of indirect objects representing the contents of a document. While it may work in many readers, I think this makes your method illegal. You can't even have unreferenced objects: "The table shall contain a one-line entry for each indirect object" says the section about cross-reference tables :- — David van Driessche.

Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. Podcast Helping communities build their own LTE networks. Podcast Making Agile work for data science. Featured on Meta.