Apply password protection and AES encryption to the confidential investigation folder PDF [filename=Investigation_2026…
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 'Printing Allowed' to 'None' completely prevents anyone from printing the document. 'Low (150 dpi)' allows printing, but only at a lower quality, which might be useful for drafts. This means the printed version will not be as sharp as the original, discouraging high-quality reproductions.
An owner password is like a key. It ensures that only the person who set the restrictions can change them later. Without it, anyone could remove the security you put in place, which would defeat the purpose of restricting access.
You should set 'Changes Allowed' to permit 'Form Fill' only. This specific setting lets users interact with form fields, entering their information, but prevents them from making other edits like inserting, deleting, or rotating pages. This way, your document structure stays safe while still being interactive.
'Restrict Permissions' means you can control what others can do with your PDF. This includes stopping them from printing, editing, or copying content. It helps you keep your document safe and ensures that only authorized actions are allowed, protecting your information.