dvdkeyauth.exe is an adult dialer application. This application will try to disconnect your current connection and call an expensive toll number. This process is a security risk and should be removed from your system.
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Non-system processes like dvdkeyauth.exe originate from software you installed on your system. Since most applications store data in your system's registry, it is likely that your registry has suffered fragmentation and accumulated invalid entries which can affect your PC's performance. It is recommended that you check your registry to identify slowdown issues