Yes, I read that article too, and it just so happens that I am planning to hang a quilt in a guild show in October. The quilt is from the Day & Night book by Eleanor Burns. My quilt is at the LAQ right now, but I called the Quilt In A Day store in San Marcos, CA....not that far from me, and asked for permission.
The woman I spoke with said that Eleanor is happy to have her quilts in any show, she is glad we bought her book, and made her quilt. She said no written permission was necessary, but that I should acknowledge where the pattern came from, which I would do anyway. I suppose each designer could have different views on this subject.
Sue