This thread https://www.theory11.com/forums/threads/when-card-tricks-go-wrong.46936/ gave me the idea to start this discussion. Does a magician who buys a book/DVD/effect from another magician has the right to perform that material? Or is it only to be used as a source of ispiration and not to perform as it is? I'm not a fan of doing effects/routines as described by the author, I always do the necessary changes to fit my style or my taste (changes either on the methot/plot/structure etc). Although, I think that if someone who acquires the work of another magician aka paid for it, as the right to perform it as it is. I would like to read your thoughts on this.