Hi, check this link https://www.mql5.com/en/code/27428 Regards Greg

Expert adviser licence protection template
- www.mql5.com
Guide 'how to' make different expert adviser license protections
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Do you have any suggestions for MT5?
check this link https://www.mql5.com/en/articles/359

Securing MQL5 code: Password Protection, Key Generators, Time-limits, Remote Licenses and Advanced EA License Key Encryption Techniques
- www.mql5.com
Most developers need to have their code secured. This article will present a few different ways to protect MQL5 software - it presents methods to provide licensing capabilities to MQL5 Scripts, Expert Advisors and Indicators. It covers password protection, key generators, account license, time-limit evaluation and remote protection using MQL5-RPC calls.
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https://www.mql5.com/en/articles/359