How to Lock Text in Acrobat

You can lock text in Adobe Acrobat by setting a permissions password so that other users cannot make unauthorized changes to a PDF. Acrobat offers several setting options that allow you to determine the type of changes other users can make to a document. You can allow no changes at all; insertions, deletions and page rotations; form filling and digital signatures; comments, form filling and digital signatures; or everything but page extracting. An additional option allows you to enable or disable the ability to copy text, images and other data from the PDF.

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Open the PDF document in Acrobat.

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Click on the “Advanced” menu, choose “Security” and select “Encrypt with Password.” Click the “Yes” button in the pop-up window.

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Place a check mark in the box next to “Restrict editing and printing of the document.” Type a password in the “Change Permissions Password” box.

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Set the “Changes Allowed” pull-down menu to your desired level. Use the check box to indicate whether you want to “Disable copying of text, images and other content.”

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Click “OK” to apply the changes to the PDF.