I have been pondering Bonnie's and Judy's frustrations and heartaches with use of their designs without attribution.
I have been teaching for about 10 years now, and have tried to do so ethically. Most of my students are new to quilting and are there not so much to learn a pattern as to have their hands held as they try new things. My weekly classes are with 3-8 students who work on individual projects with my assistance. Many of them are using commercial patterns, or something they have gotten from a magazine, book or the internet. I don’t believe this interferes with copyright as my class in not to teach that pattern, but to assist the student’s interpretation of it.
I try to use traditional blocks in my workshops, drafting my own patterns and instructions, and including a list of websites and books where students can look up related/similar patterns for future use. I encourage people to purchase the patterns or books themselves, to not copy another’s.
On occasion, I have an out of print magazine pattern I do copy, and I am afraid, this does infringe on copyright law. I don’t know if teaching for a non-profit educational site gives me any coverage for this or not. I’ve taken a workshop on creative use by a quilter/lawyer. It answered many questions, and brought up many more.