On a Linux machine owned by you? Easy, force the user to log in as a user with no access to the shell, file managers, etc. They'll have no way to copy the file.

On a Linux machine owned by someone else? You'll have to use the concept of DRM, and unfortunately DRM on Linux is crippled by it's open-source nature. The kernel isn't locked down the way the Windows and MacOS kernels are, so you can't rely on the OS as the root of trust.