the adobe one has a keygen thing, the rest are network file shares with license in a txt file.
My company is going through the hiring process for the first time now, so we're trying to establish a procedure for managing licenses.
It's pretty clear that when you're given a keygen something isn't legit, but for installed software it's probably not so easy to tell.
As a small business owner I can definitely see the temptation to do this. For someone not involved in software production, it may appear to be a victimless crime.
On the flip side I know first hand that some people just don't get it. A software license is a foreign concept to them. It's complicated by the various types of licenses: user licenses, sites licenses, family licenses, etc. Some licenses permit a desktop and laptop install. Some don't.