Password-protecting a document is the best way to safeguard its content and ensure it won’t end up in wrong person. Depending on your platform, many tools can help you add security to files on which you keep sensitive information. However, the most sure-fire and straightforward way of handling this task is utilizing DocHub.
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In this video tutorial, the presenter shows how to sign a PDF file that may not allow you to insert your signature. They demonstrate signing a normal PDF file and then highlight a PDF file that does not allow signing by default. To solve this issue, they instruct you to go to 'File', select 'Print', choose 'Microsoft print to PDF', change the settings, and save the file. This will enable you to insert your signature in the PDF file. If you need more guidance on inserting signatures, they provide a link to a video tutorial in the description.