I can help you to protect any of your EA's. That protection is adding the expiration date into your EA, so you can share your EA or rent for somebody for a limited period of time. How long is your decision.
Current date is 2020.05.01
You want to limit your EA till 2020.05.31, after this date your EA will stop to work.
It's very easy to change the date in the code, you will take only 1 minute to do that.
This offer valid for expert advisor of MT4 or MT5. Tutorial how to change the date will be provided.
Price is 10 euros per 1 file.