Dave
There are levels of infringement meaning that the worst and the most likely to get you in a federal court is if you infringe and make lots of money on the infringement and then refuse to remove it.
If you are an innocent infringeR and you immediately remove the copyrighted work when asked then if the author gets you before a federal judge more than likely the judge will ask what's the harm?
However, with the way federal judge are appointed for life these days maybe not so much.