Okay, so I have looked this up, again. I was an expert in this area for work purposes around the 2000-'10. Checking the law now, the definition of fair use in the US has changed, been modified to extend "IP stored in digital files" as protected even in private. However, it is pointed out that there is no means of detecting such private uses, and any actions enabling the detection of this private use are no longer private and fall right into the previous IP law.