JitBit Enkodr is the world's easiest "on-the-fly" text encryption software. It works in conjunction with ANY text-editing program: MS Word, MS Outlook or even a web-based email like GoogleMail or Yahoo.

Just enter some text (in ANY program)
Select the text with your mouse
Press a keyboard shortcut
Choose a password
The text will change to a completely unreadable set of characters.

The license of this software is Free Trial Software, the price is $24.85, you can free download and get a free trial.