MIL-STD-1553 Serial bus trigger and analysis for Rigol MSO/DS7000 series oscilloscopes. Each licence contains a unique product key. The product key is used to generate a software licence code that must be entered into your instrument. To generate a Rigol software licence code using your Rigol product key, please see HERE. Installed software licence codes are permanent - They are unaffected by Rigol firmware updates.