MQL4 EA decoder expert wanted

I need to make some changes to an Expert Advisor for which I only have the ".ex4" file.

More precisely, I would like to extract the "source code" and create a similar Expert Advisor but with my own data.

The Expert Advisor that I would like to decode and make "proprietary" has excellent reliability, I know this because I participated in the creation of the original software as a trader analyst and strategy developer.

Please note! The Expert Advisor requires an activation key to use. I would like to remove this detail as well.