That isn't the tricky bit, generally you have a large organization, it has many moving parts, and general staff turnover. At some point there are parts of the system that "just work" and nobody at the place really knows all the various bits that go into the works. When one of those bits is carrying a license that needs to be paid, negotiated, but you don't know it, it bites you in the backside.

A more common example of this is a hard working engineer who, practicing DRY, finds a perfectly serviceable piece of code on Github which he plugs into the source tree with just a few small changes to hook up the plumbing. Never once checking the license terms. Those things blow up when you get a demand letter from the owner of the code. Most shops though have a license compliance officer type person who is checking for such things.