@newt @SuperDicq Trivial edits to binaries without the source code isn't that hard, although doing so is illegal (current proprietary OS's don't appear to directly report such illegal modifications to the government yet).

A lot of the time you just want to change an output string or NOP out a function that implements digital handcuffs, which is a pain in the neck to do, but is possible.

But, doing much more than that potentially requires thousands of hours of work, for something that would take a few dozen hours with the source code.