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How do I password protect a PDF file so that it cannot be edited?

How do I password protect a PDF file so that it cannot be edited?

You can add security to documents in order to prevent subsequent editing, as detailed below:

Click the File tab, then click Document Properties and navigate to the Security category:

2. Change the Security Method to Password Security, as detailed above.

The Password Security Settings dialog box will open:

Use the Compatibility dropdown menu to determine the compatibility of the PDF.
Select an encryption option button to determine which elements of documents are encrypted.
Select the Require password to open the document box to set a password for opening the document. Enter the password in the Document Open Password text box and confirm it in the text box below.
Select the Restrict editing and printing of the document box to set a password for editing and printing the document. Enter the password in the Change Permissions Password text box and confirm it in the text box below. Use the dropdown menus and check boxes in the Permissions section to select the settings that these passwords will enable.

Click OK to save settings.

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