Silver Key Free Edition USB allows you to password protect files and folders in your external USB drive. This program is portable, which means it needs no installation. Just place the .exe file in the pen drive and run.
Silver Key Free Edition USB uses a wizard based GUI so to protect your files and folders you just have to follow in program step by step instructions.
Silver Key Free Edition USB can create self decrypting files which means the don't need to run Silver Key to open them. To open the protected files and folders all you have to do is remember the password.