3 ms·
This is not entirely true, you can encrypt PDFs [1] since v1.3 of the spec but the cypher is often so weak (RC4 until v1.6) they can be bruteforced in reasonabl
by r00fus 6y ago
This is not entirely true, you can encrypt PDFs [1] since v1.3 of the spec but the cypher is often so weak (RC4 until v1.6) they can be bruteforced in reasonable amounts of time.
[1] https://www.pdflib.com/pdf-knowledge-base/pdf-password-security/encryption/ https://www.pdflib.com/pdf-knowledge-base/pdf-password-secur...
- Thorrez 6y agoYou can encrypt them to completely prevent them from being opened. But cgb223 wasn't talking about that, cgb223 was talking about the ability to open them but not copy text, or not print.
- benmmurphy 6y agoYou can make the text uncopyable by using non-standard font indexing. The reader will be able to copy the text but it will be gobbly-gook. It forces the user to OCR the PDF or reverse the font mapping.
- hnick 6y agoAnd ain't that a treat when clients send us PDFs to sort, print, and mail, but the address extraction fails completely.