[anonbanker]

This comment is a perfect example why arguing over proprietary software is mostly conjecture: nobody can look at the code and see what's different.

[nickpsecurity]

I'll mostly agree with that. Harder to do looking at assembler. However, at behavioral level, you can just black box it to see if it passes acceptance tests for desired outputs. If it does, it might be same for your needs. If it doesnt, it's clearly a problem.

Your point applies totally if we're talking the How instead of the What.