An image data processing device may be configured to be used in a system. The system may comprise the image data processing device, a management device and a plurality of electronic devices. The image data processing device may comprise a communication unit configured to communicate with the electronic device by using the first communication scheme. The image data processing device may cause, in a case where the communication unit receives the judgment information from the electronic device, a storing unit to store the received judgment information. The image data processing device may execute the image data processing in a case where it is determined that the processor is able to execute the image data processing based on the judgment information stored by the storing unit.