**You can add passwords with manual methods like WPS Office and Adobe Acrobat. But there is one problem with using WPS Office it takes very much time to lock PDF Files in Bulk because it can apply passwords or restrictions only on one PDF file at one time. Also, Adobe Acrobat is not good for every user, because you have to take a subscription to Adobe to take the facilities. So, you need a trusted Automated tool that can save you time and money. According to these scenarios, there is only one method which is given by the technical experts of SysTools.They created a PDF Lock Software that can help users properly. Also, it is free to use in the demo version.

Steps to use this automated third party tool.

Step 1. Download the software and launch it.

Step 2. Add PDF files or folders to make them restricted or protected.

Step 3. Click the Next button and apply the password according to the requirement.

Step 4. Select the Encryption Type and Click on the Lock button.

**

Yes, there are several methods to lock your PDF files for added security. One common approach is to use password protection, where you can set a password to restrict access to the document. Another method is to encrypt the PDF, which scrambles the content and requires a decryption key to view the file. Additionally, you can use digital rights management (DRM) software to control who can access, copy, or print the PDF. These methods help safeguard your sensitive information and ensure that only authorized individuals can access the document. Consider exploring these techniques further for your dissertation real estate topics, especially in discussing strategies for protecting confidential real estate documents and contracts.