The comments about copying others are soooooo well founded and everyone should re-read them. I have told so many magicians that I have seen doing the "invisible deck" that they are doing ripped off material stolen without permission from Don Alan. Most of their comments were "well the lines work for my audience so I am keeping them" or "others use them why can't I?". Amazing, simnply amazing, and they will keep on doing it too.
Although a few years back there was a so called comedy magician working the comedy circuit that was doing Fileding Wests act VERBATUM. I hauled him aside and he actually had the nerve to try to tell me that it was all his original material (including Bob the bird). I warned him and left. A few months later I get a frantic phone message from my manager (while I was on a long three month tour) saying that I need to call this schmuck as he is threatening law suits against me.
I call him and he says "Where do you get off telling all the clubs that I am doing stolen material, I am going to sue you!" to which I said "Dave, you go ahead and keep doing it and when I get back down to Vegas I'll let Fileding know and he can take whatever action he deems appropriate. If you have trouble with that, then by all means go ahead and sue me but know that Feilding's act is copywritten by the Screen Writers Guild, so if you really want a war, you keep this up" and I hung up.
Short story made even longer, he killed himself later (not due to this however) BUT I am told that he stopped the act as no one was hiring him BUT his now ex business parner actually defended him which really makes me sad because he IS a well known, working magician.
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