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Max from Unsubscribed Healthcare explains how to add a lock to your PDFs. You can download a PDF from Google Drive or export it from Google Sheets. Open the PDF in Preview on a MacBook. In Preview, go to File, Edit, Permissions, and require a password to open the document. You can customize permissions to prevent inserting, deleting, copying, annotating, or adding signatures, allowing only printing. Apply the changes to secure the PDF.
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