With no copies made I got the master keys

from Drake – Asthma Team Lyrics on Rap Genius

Meaning

Usually with a key, someone has to have it. The original key can be described as the ‘Master Key’. But if you make copies, there will be only One Master key. with more copies made, its harder to get the original one.

Master Keys is a reference to the Kilos, he’s saying he has the main product.

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