If you want to ptotect the images saved on your pendrive or memory card used in your digital camera, you can with Pen Protect. It is a simple tool with which you can encrypt files and folders with a password, so no-one can access them without permission. The data protection is done using an AES 256-bit algorithm, which never alters the content of the file.
You can encrypt all the files, or just those selected. There are two protection levels: Total, which takes longer but is 100% secure, or Partial, which is quicker but not so secure.
Pen Protect requires no installation. It is just a file that places itself in the start folder of your USB or memory card. It is easy to use. Just run the PenProtect.exe file and it will automatically open a window where you must insert the password you want to use. Once configured you have the chance to encrypt or de-encrypt the files you want. Also, it includes a help file in case of doubt.