copy right laws are laws and do hold up in court rooms, so, maybe just maybe, you should make it a practice, if you want to display your work in public places make sure you either #1. ask permission from whom ever the design belongs to, or #2. make sure your work is original.
if you notice in that same article it does tell you you can sell the quilt, you can give it away, you can keep it, you just have to ask first if you are going to display it anywhere public. it is the same for any copyrighted item; there is no point in being all upset about it, just learn the law and live with it. it has nothing to do with quilt police, it has to do with THE UNITED STATES COPYRIGHT OFFICE.