We keep overprotecting pricing and alienating partners, or under-protecting and leaking numbers. From recent sends, sh…
Open the PDF file you want to restrict in Adobe Acrobat Pro.
Select File from the top menu, then choose Properties.
In the Document Properties window, click the Security tab.
From the Security Method dropdown, select Password Security.
In the Password Security Settings dialog, check the option to restrict editing and printing of the document.
Set a permissions password when prompted.
CautionIf you forget this password, you cannot change or remove the restrictions later.
Choose the specific restrictions you want to apply (e.g., disallow printing, disallow editing, disallow copying).
Click OK to confirm your settings and close the dialog.
Click OK again in the Document Properties window.
Save the PDF to apply the new permissions.
Best practiceTest your restricted PDF in a different PDF reader or with a different user account to confirm the permissions are enforced.
You can review or change these restrictions later by reopening the Document Properties and returning to the Security tab.
This runs in the Acrobat app - there is no separate API for this task.
| Setting | Description | Use Case |
|---|---|---|
| Low (150 dpi) | Allows printing at a low resolution, which means the print quality will not be very clear. | Good for quick drafts or when you want to allow a basic print but not a high-quality copy. |
| High | Allows printing at the best possible resolution, resulting in clear and sharp prints. | Use when you want people to have a high-quality physical copy, but you still control other actions like editing. |
An owner password is very important because it is the only way you can change or remove the security settings you put on a PDF. Without it, the restrictions are permanent, and you cannot edit them. It protects your ability to manage your own document's access rules.
No, if you forget the owner password, you cannot remove the protection. The document remains locked with the set restrictions. This is why it is critical to keep your owner password safe and remember it. Adobe's API also requires the owner password to remove protection, so there is no workaround.