LockPDF is a powerful online tool that helps its users protect their PDF files from unauthorized access. It allows users to password protect their PDF documents, preventing anyone from opening the file unless they know the password. Additionally, users can set restrictions on the PDF file, such as preventing printing or editing. LockPDF also allows users to remove any existing passwords and restrictions from PDF files, as well as remove any digital signatures. LockPDF is easy to use and offers a secure and reliable way to protect your PDF documents.
The last discontinued version, 1.3, was released in August 2007. It can still be downloaded from the official website.