IDM has a robust online validation system. Every time you enter a serial number, IDM connects to Tonec Inc.’s servers. If the serial has been flagged (e.g., “L4L5-6I7K-...”), you will see the infamous fake serial message: “You have registered IDM with a fake Serial Number. Please buy a license.”
Continued support for up to 32 simultaneous connections per download to maximize bandwidth. Serial Number & Registration