When you encrypt information you can set an encryptionexpiry date. This is the date on which you want the encrypted information to become inaccessible (so no one can decrypt it anymore). For example, you might store some encrypted information on a computer that could possibly be accessed by an unauthorized user, such as a notebook that is taken from work to home every night. If you set the encrypted information to have an expiry date of few days away, it gives little time in which someone can try to access the encrypted information.
If the above options do not provide enough security for you, download Access manager for Windows.
Access manager provides much more security than standard ways in Windows.
More articles about Security