Information processing device performing software license authentication, communication system, and software license authentication method

A communication system comprising:

• a first information processing device;
• a second information processing device which is connected to the first information processing device through a communication path,
• wherein the first information processing device includes
• a storage unit which has an application program executing predetermined processing and first device identification information for identifying a host device,
• an authentication management unit which has unique information of the application program,
• the second information processing device includes
• a storage unit which has the application program and second device identification information for identifying a host device, and
• an authentication management unit which has the unique information,
• the authentication management unit of the first information processing device acquires the second device identification information from the second information processing device,
• calculates a first value on the basis of the acquired second device identification information, the first device identification information, and the unique information of the host device,
• generates a first authentication key on the basis of the calculated first value, the first device identification information, and the second device identification information,
• transmits the generated first authentication key to the second information processing device,
• acquires the second device identification information from the second information processing device for each predetermined period,
• calculates a second value on the basis of the acquired second device identification information, the first device identification information, and the unique information of the host device,
• compares the calculated second value with the first value of the first authentication key, and
• when the second value does not coincide with the first value, stops the activation of the application program, and
• if the first authentication key is received from the first information processing device,
• the authentication management unit of the second information processing device stores the received first authentication key in the storage unit of the host device,
• acquires the first device identification information from the first information processing device for each predetermined period,
• calculates a third value on the basis of the acquired first device identification information, the second device identification information of the host device, and the unique information of the host device,
• compares the calculated third value with the first value included in the stored first authentication key, and
• when the third value does not coincide with the first value, transmits a stop instruction to stop the activation of the application program of the first information processing device.