(< Portable Document Format,
"porditav dokumendivorming")

olemus
omanduslik failivorming (Adobe Systems, 1993)
dokumentide esituseks platvormist sõltumatult
trükindusele sobivana: PDF-failis on kõik vajalikud
elemendid ja parameetrid dokumendi sisu ja vormistuse
originaaliga identseks taasesituseks

Wiktionary:
1. (file format) a standard for representing electronic documents, allowing them to be transmitted and reproduced accurately with the same printed layout

ülevaateid
http://www.printmyfolders.com/understanding-pdf

http://resources.infosecinstitute.com/pdf-file-format-basic-structure/

https://en.wikipedia.org/wiki/PDF

https://acrobatusers.com/tutorials/filter/search&category=89&channel=tutorials/

veebisait
https://www.adobe.com/devnet/pdf/pdf_reference_archive.html

standardid
https://www.iso.org/obp/ui/#iso:std:iso:32000:-1:ed-1:v1:en
https://www.iso.org/obp/ui/#iso:std:iso:32000:-2:ed-2:v1:en

turvalisus
https://www.pdf-insecurity.org/index.html

https://www.wikihow.com/Unlock-a-Secure-PDF-File

https://superuser.com/questions/179064/how-to-remove-security-from-a-pdf-file

https://www.pdf-tools.com/pdf20/en/products/pdf-security-signature/pdf-security/

https://www.blackhat.com/presentations/bh-europe-08/Filiol/Presentation/bh-eu-08-filiol.pdf

https://www.zdnet.com/google-amp/article/new-shadow-attack-can-replace-content-in-digitally-signed-pdf-files/

https://freedom-to-tinker.com/2022/05/19/a-pdf-file-is-not-paper-so-pdf-ballots-cannot-be-verified/