As said by TheMajor, if your file system is encrypted using some type of software, you *should* be able to clone it, but there is no guarantee that it will work, as the drive may not properly decrypt. It also depends on if the program changes the fileformat in a way, that windows can recognize portions of it, but then needs to use that software to decrypt on the fly.
If it is a hardware level encryption, such as a HDD lock password, there is no way to copy unless you remove that password first, then do the image, and re-enable the password. I tried this on a Dell Laptop that had a locked drive, I couldn't access it until the password was removed.