What’s the difference between user password and owner password?
A PDF file may be encrypted for security, or digitally signed for authentication.
The standard security provided by Acrobat PDF consists of two different methods and two different passwords, "user password", which encrypts the file and prevents opening, and "owner password", which specifies operations that should be restricted even when the document is decrypted, which can include: printing, copying text and graphics out of the document, modifying the document, or adding or modifying text notes and AcroForm fields. The "user password" (controls opening) encrypts the file and requires password cracking to defeat, with difficulty depending on password strength and encryption method – it is potentially very secure (assuming good password and encryption method without known attacks). The "owner password" (controls operations) does not encrypt the file, and instead relies on client software to respect these restrictions, and is not secure.
Portable Document Format Security:
- VeryPDF PDF Tools- set PDF information/page size/passwords/watermark
- Despeckle PDF & image and then convert scan PDF to word document
- An affordable PDF viewer ActiveX (capabilities to zoom, print and save PDF files)
- How to merge PDF documents of specific pages?
- VeryPDF TIFF Merge and Split—a good tool for you!
- How to draw a line-shaped comment in my pdf file with VeryPDF PDF Editor?
- Questions about programmatic PDF printing from MFC CHtmlView, convert from CHtmlView to PDF file, print from CHtmlView to PDF file
- A way to enable pdf fast web view using command line
- Convert documents of RTF to PDF and set PDF password by command line
- How can we read files like ppt, doc, pps, rtf in Android without application installed？
- A convenient way to encrypt pdf in batches with command line
- PDF Encryption Algorithms and Key Length
- A quick way to encrypt pdf for great pdf security
- VeryPDF PDF Encrypter for Mac can be used to protect your PDF files with 128-bit strength user and owner passwords, set all permissions(such as coping, editing, printing, selecting text and graphics, fill in etc.), and prevent PDF files from being printed, changed, copied, extracted, signed, filled, assembled and/or merged
- How to protect PDFs with setting expiry date?
This entry was posted in PDF Security
. Bookmark the permalink