Protect PDF file Read Only

Open your PDF file. Do this:

File > Properties… > Select “Security” tab > Select “Security Method” > Choose “Password Security”

In “Password Security” window, mark this check-box:

“Restrict editing and printing of the document….”

In “Change Allowed” choose “Commenting, filling in form fileds, …”

Enter a Password and confirm that again.
Hit “OK” button.

Save your document and close it.

Now, your document is protected with password.

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