If I understand right (I'm not a lawyer), something like this came up in a case about a utility for cheating in an online game, and another much older one about the copy of an app made in memory in order to run it.

For the purpose for which the software was sold and bought, the in-memory copy is legit[1]. For cheating, it's a copyright violation[0].

[0] https://www.engadget.com/2008-07-15-blizzard-wins-lawsuit-ag...

[1] http://digital-law-online.info/lpdi1.0/treatise20.html