KryptoSpace lets you choose a number of folders to encrypt. These folders will be encrypted, but still visible at their original emplacement. For example, if you have confidential documents, you can just encrypt your Documents folder.
KryptoSpace will create a secure disk (using the same technology as Apple FileVault), and it will securely delete the original content.
If you choose to store your password in the system KeyChain and to automatically mount encrypted directories at login, you can work as usual.
You can be sure that if your computer is stolen, nobody will be able to access your data, even if they have physical access to your hard disk. In the same way, the system administrator has no access to your data.
You don't need to be administrator to use KryptoSpace.