(currently the download link on the Locknote website is labelled “overview”)
To prevent storing sensitive or confidential information in text or word processor files, there is a FREE utility called Locknote (for Windows only), which is basically a Notepadreplacement which encrypts the data along with the program, all in the same single file and is protected by a password of your choosing. You can take this file to any other Windows computer and open it again from there – with the password. Don’t lose your password – the encryption method (AES-256) is currently unbreakable.
For non-Windows users, there is a FREE cross-platform alternative called Encrypted Notepad which behaves in exactly the same way as Locknote, but will work on different operating systems (eg. Mac/Linux and possibly even some mobile phones!). The FAQ section of the website is amusing and worth a read. It uses a weaker encryption method than Locknote (AES-128) but that is still currently unbreakable. However, it also requires Java in order to run, which in itself is a security concern due to the number of Java exploits which have been discovered – even in recent versions.