The director wants the appraisal reports locked so only she and the registrar can open them while we finalise funding …
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 choose 'Printing Allowed: None', no one can print your PDF at all. If you choose 'Low (150 dpi)', people can print the document, but the printed quality will be low, like a draft. This means the images and text will not be sharp, which can be useful for sharing drafts without giving high-quality copies.
An owner password is like a master key. It is needed so that you, the owner, can still make changes to the document later. Without it, even you would not be able to change the restrictions or edit the PDF once it is locked. It keeps you in control.
If you want to remove protection, you will need the owner password. In Acrobat, you can go to the security settings and choose to remove the protection. You will be asked for the owner password to confirm. If you use an API, you send a request with the owner password to the 'Remove Protection' endpoint.