Wat is the best and most recent way to Protect my plugins grom piracy and multi-use ?
I Read alot of outdated topics. Please advice
Here u go 
You can look at https://build.envato.com/ to build your own licensing system.
Bear in mind that anyone can change the code for this and even remove the license check from your app. You’re not allowed to “encrypt” your source code.
Hi @R3dRidl3.
You can check our script that uses Envato API, for checking client purchases and the end of support Time.
This is only a Purchase code verifier:
If you have interest, there is also a CMS specially for themeforest developers, that already that built in feature.
Best regards.