The process cdantsrv.exe is part of the C-Dilla License Management Software Macrovision suite, used for digital rights management (DRM), i.e. managing access rights for copyright-protected content.
The file that corresponds to this process is normally found in the directory "%SystemRoot%\system32\DRIVERS\CDANTSRV.EXE" (where %systemroot% is usually C:\WINDOWS.)
It is an application which can safely be terminated.
