I agree with a previous poster that copyright belongs to the actual words.
As for the LQS teaching a method, if the method is available in a bunch of resources (from different people/sources), then I don't have a problem with the teacher teaching it without requiring purchase of a book as long as the teacher has created all her handouts/instructions in her own words (and maybe include a list of her favorite resources for additional info). If the method is only available from a specific author, then I'd think the teacher should require purchase of the book, unless the author gives permission otherwise. Just my two cents - not a lqs owner or teacher, not an attorney, not an author.