We have a finalized experimental protocol that needs to be locked so only authorized staff can view it, but auditors m…
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.
When you set 'Restrict Permissions' in Adobe Acrobat, the lock only stops printing, editing, or copying. It does not stop people from searching the text inside the PDF. This means your document content remains fully searchable, even with security settings applied.
The owner password acts as the master key for a protected PDF. It is needed to remove protection because it confirms you are the document's creator or authorized manager. Without it, anyone could bypass the security settings, making the protection useless. This ensures only specific people can change the document's security rules.
No, if you set 'Printing Allowed: Low (150 dpi)', printed copies will not be clear. 150 dpi (dots per inch) is a low resolution, which means the text and images will look blurry or pixelated when printed. This setting is good for sharing documents where you want to prevent high-quality physical copies.
| Setting | Effect |
|---|---|
| Printing Allowed: None | No one can print the document at all. Printing is completely blocked. |
| Printing Allowed: Low (150 dpi) | People can print the document, but only at a low quality. The printed copy will look blurry. |
Restricting 'Changes Allowed' for inserting or deleting pages helps maintain the integrity and original order of your document. For legal documents, contracts, or official reports, it's crucial that the page sequence and content remain exactly as you created them. This prevents unauthorized people from altering the structure or removing important sections of the PDF.