Comment Re:Prohibited (Score 2) 109
Sure but that's a civil contract violation, not a criminal case. The people doing the de-compilation could get account banned or lose their license to play the game. If it can be proven that they performed copyright violation by distributing copy-written material to others that wouldn't fall under fair use or other narrow copy right exceptions they could be sued for potential damages. But decomp projects tend to be explicitly very careful about not distributing anything that could be a copy writable asset like art or sound files, generally requiring someone to provide their own copy of the game (presumably legally acquired) to extract art assets or provide their own substitutes.
There's a lot of legally grey stuff that might be protected under US, EU, or other location's law depending on jurisdiction related to de-compilation, since the source code provided by the decomp team might create a functionally identical binary executable but will not be a 1 for 1 match of the official original source code.