As a pattern designer I understand the copyright issue! It really irks me to go to a class at a guild and receive a copied pattern from a book. Ugh! The technique issue is a different ball of wax. If the technique is patented or trade marked you can only share it with the owners premission. If it is not I would show how I did it but not give measurements and such and suggest they get a copy of the book. Either at the libraries(guild or local) or purchased. This is a sticky subject for designers and quilters. Many patterns are in public domain. I write a pattern with them and my written instructions are copyrighted. You see my pattern and go home and make a quilt just like mine w/o using my written instructions using all the public domain blocks. Are you in violation of my copyright? NO! If you buy my pattern and make 1 or more copies of my pattern and give them to your friends have a class etc using the written instructions, then you are in violation of the copyright laws. Simple. Not so much now if I included an original block not in public domain. I own the copyright to that block for writing the instructions. Many designers have trademarked or patented their work and they own it. Even if a hotel uses it as a pattern for a rug w/o the designers permission! The debate can go on foreever. I would ask the author of the book for permission to demo her technique and advise the students to buy the book for the rest! Just My Humble Opinion! Luann