Glossary / PDF Permissions
PDF Permissions Explained
PDF permissions are access control flags embedded in a PDF file that restrict what users can do with the document. Permissions can control printing, copying text, editing content, adding annotations, filling form fields, and extracting pages. They are enforced through the owner password mechanism defined in ISO 32000-2.
How permissions work
When a PDF is encrypted with an owner password, the creator sets permission bits that specify which operations are allowed. A compliant PDF reader checks these bits and enforces the restrictions. Common permission flags include:
- Print document (low resolution or high resolution)
- Copy or extract text and graphics
- Modify document contents
- Add or modify annotations and form fields
- Fill in existing form fields
- Assemble the document (insert, rotate, or delete pages)
Important limitation
Permissions rely on PDF reader compliance. The underlying data is still encrypted, but a reader that ignores permission flags could bypass restrictions. For strong security, always combine permissions with a user password that prevents opening the file entirely.
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