Look at the post #14 (where I collected everything which I found about it).

I need to Lock my expert based on my account number and broker
- 2020.01.09
- www.mql5.com
I need a help how to lock my EA/Script based on my login account number and one broker only such as "FXDD...

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Hi all,
I want to know that how to put license key in our products if we want to sell them outside mql5 with some restrictions like number of account allowed, expiry date, number of demo or real allowed etc