FusionDex

In many regions, owning Klefgon is illegal or highly regulated. This is due to its ability to bypass passwords and locks on files, letting many use it to play video games without purchasing them.

It is capable of reverting itself entirely back to program data in order to enter cyberspace. It never lets go of a key that it likes, so people give it the keys to vaults and safes as a way to prevent crime.