Yes, you can lock a PDF to secure your information, and cannot be shared with other unauthorized users. Make use of the PDF Protector utility to secure PDF files with high locking security with a unique Password on multiple PDFs at the same time. the tool restricts all unauthorized users and third-party applications from making any modification of data that can’t be shared with other users. they can keep data on specific locations on the user’s desktop. It is easy to use with a friendly interface. You can download its demo version for free to check how it works. This application runs on all the Windows versions. Read More: Protect PDF – Secure PDF File – Add Restriction in PDF Document