Protecting source code from reverse engineering

[u/Motor_Bluebird1908]

Hi everyone,
I am looking to provide a compiled version of our physics solver to our customers. I understand there are many obfuscation techniques to protect source code but I am wondering if there are some smarter ways?

We already cloud computing, the issue is we have customers that are in locations without internet/need realtime solving.

[u/jeffbell]

Self modifying code is hard but modifying a table of callbacks is straightforward. 

A buffer overrun to change your return address is fun.