Data processing apparatus and control method thereof with generating of single unique identification information using device identification information, device state information and recording information

A data processing apparatus comprising:

• a holding unit configured to hold device state information which is updated according to use of the data processing apparatus and represents number of times of a predetermined operation of the apparatus, and device identification information unique to the apparatus;
• an acquiring unit configured to acquire time information associated with generation of recording data or setting information indicative of setting state in said data processing apparatus upon generating the recording data, which is different from the device state information, as recording information, in association with the recording data;
• a generating unit configured to generate single unique identification information of the recording data by using the device identification information, the device state information, and the recording information without using other information;
• and
• a recording unit configured to record a file including the recording data and the unique identification information generated by the generating unit in a recording medium.