Many people have sensitive or confidential data on their personal computers. Controlling access to this data can be a problem. PC's, and laptops in particular, are highly vulnerable to theft or unauthorized use.
Encryption is the most secure means of protection, but is often cumbersome to use.
The user must decrypt a file, work with it, encrypt it, and then wipe the plaintext. If encryption were easy, many more people would use it. SecureDrive is a step in this direction. It also allows you to encrypt floppy disks. The TSR takes only 2.7K of RAM, and can be loaded high.