If you want to password-protect your PDF documents from outside interference, then maybe you should give PDF Page Lock a test run. It is a free encryption software that lets you easily encrypt PDF ...

How to Merge Encrypted PDF Files. Small businesses working with sensitive PDF documents may choose to encrypt those documents. An encrypted PDF is password protected, which means you cannot open ...

How to encrypt and password-protect ZIP files the right way This tip was originally published on IDG Answers, a reader-powered help desk for answering tech questions.

You can use the free PDFGear app to encrypt a PDF. Open the PDF file in the program and click the Tools tab at the top of the window. Now, click the Password icon, enter and, in the Set Password box, ...

With a few steps you can set up an easy way to encrypt PDF files generated from the standard print dialog window.