From USB Safeguard:
USB Safeguard is a portable software program to encrypt and protect data with a password on your removable pen drives using the AES 256 bits encryption. The main purpose of using a USB pen drive is that you can bring your data with you wherever you go. But if you lose your USB pen drive your data also lose. This is dangerous if you have confidential files stored in it. Protect the pen drive with a password. USB Safeguard offers users (novice and expert) a security solution that fully protects valuable data stored on USB pen drives. Also, the program has a useful feature that allows you to enter your email or phone if you lose the pen drive. Free version works only with USB Flash drive of size max 2 GB.