Beat licensing: Non- exclusive licensing question

I know in recent years it has become very popular to lease beats online and I know of many producers who have been able to develop some strong incomes from it. My question is about the terms of beat leases. Often times, I see people say that you can distribute up to "XXXX" units of the song in the terms of their leases. Has anyone found an effective method to track the distribution of materials by artists?
 
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