If you have DriveSecurity 2.X and earlier please update to the latest version from:
• Windows: http://clevx.com/Installer/DriveSecurity-Installer.exe
• Mac: http://clevx.com/Installer/InstallDriveSecurityMac.zip

See What Version do I have? to find your DriveSecurity version.

If your DriveSecurity shows “License expired” (see below) you will need to purchase a new license.
Icon in System tray shows ”block” sign

Mouse over on Drive Volume Name at the bottom right shows “Not Licensed”

Click on yellow Shopping Cart “Buy Now” button to purchase a new license. You will be redirected to DriveSecurity purchase page. Once purchase is completed, your DriveSecurity will be automatically re-activated, you don’t need to enter the License Key.

If you have already purchased your license, you can activate it by tapping on Activate button and entering the License Key.