You can get this error on a paid, legitimate seat. It is not always a piracy accusation.
For and newer, look for the automatic update notification in the bottom-right corner of the interface. this copy of mastercam is not genuine verified
: If you use a physical USB key (HASP), ensure it is securely connected. Try yanking it out and jamming it back in to reset the connection, as connection issues often trigger this message. You can get this error on a paid, legitimate seat