When you protect a PDF, you are really choosing between two different mechanisms. People often mix them up, and then assume a document is more secure than it is.
The Two Password Types
| Open password (user password) | Permissions password (owner password) | |
|---|---|---|
| Question it answers | "Who can view this?" | "What can viewers do?" |
| Without the password | File cannot be opened | File opens normally |
| Controls | Access to all content | Printing, copying, editing, form filling |
| Strength | Strong when the password is strong | Depends on the viewer respecting it |
Open Password: Real Encryption
With an open password, the content is encrypted. A viewer cannot display the pages until the correct password is entered. This is the right choice for salary slips, bank statements, contracts and personal records. Its strength depends entirely on the password — see how to create a strong PDF password.
Permissions Password: Usage Restrictions
A permissions password lets anyone open and read the file, but asks compliant viewers to block actions like printing or copying text. It is useful for:
- Sharing a price list that you do not want edited.
- Publishing a report that should not be copied word for word.
- Distributing a form that should be filled but not altered.
However, some software ignores these restrictions, and anyone who can see the page can still take a screenshot. Treat permission settings as a polite barrier, not a lock.
Which One Should You Use?
- Confidential content: use an open password.
- Public content you want to discourage editing of: use a permissions password.
- Highly sensitive content sent to one person: use an open password, share it through a separate channel, and send only the pages they need.
How to Add Protection
Use Protect PDF to add a password to your document, then test the result by opening it on another device. If you also want a visible reminder that the file is confidential, add a watermark — use Watermark PDF.
Removing Protection From Your Own Files
If you own a protected PDF and know the password, you can remove it when protection is no longer needed — for example before merging or converting. Our guide on removing a password from a PDF you own explains the process and the legal and ethical limits.
Key Point
Only an open password keeps the content itself private. Permission restrictions control behaviour in cooperative software, which is helpful but not a substitute for encryption.
Watermarks and Passwords Together
Passwords control who can open a file; watermarks tell everyone who opens it how it should be treated. Many organisations use both: an open password for delivery and a visible "Confidential" mark so printed or screenshotted copies still carry the warning.
