@haliloo There are several ways to limit the EA for particular reason (offline).
Use some of those blocks in fxdreema for instance
0_1569234400298_231d63ce-ff12-4f07-952c-1c098e8bd3b1-image.png
In addition you may set an expiry date see here.
You may also lock your EA to a certain account number, but than need to compile a version per account number(s). See here!.
If you really want to protect your code even for decompiling, I think you may need a commercial service such as Mqllock .. I picked just one well known for demonstration and don't want to advertise a comercial product here. Use your preferred serach engine to get a market overview.