This is another issue that we see eye to eye.
It's oxymoron to even suggest that a particular magic trick is copyrighted. If the trick is made a secret and not published at all, how can it be copyrighted in the first place ?
Since the organisers have set the rule in advance that contestants must contest with original tricks, then Liu Qian as judge disqualifying contestants with copied tricks is non-issue. There're two issues left then.
1. The bad behaviours of the disqualified contestants. That I've mentioned in my earlier post, I find them a disgrace to their country and the fraternity of magicians. Whether professional or amateur, a magician's first lesson is etiquette. These ruffians aren't fit to be magicians.
2. The ethicity of copying tricks. Note that this isn't the same as breaking the magicians' code by revealing trick secrets and breaking others' ricebowls. There're generally two ways to become able to copy a trick of some degree of difficulty. Learn it from someone, or watch the trick being performed by another and figure out the secret.
Books and gadgets available at common magic shop teach common tricks only, more like party tricks rather than stage or contest tricks. However, these give the amateur magicians the foundation to learn more complicated tricks and even figure out some. Then and only then is the amateur at a level to design own set of tricks.
Magic can be copyrighted but it require filing the details at the copyright office. No professional magician would do that with treasured tricks because these becomes documents available for public inspection and self-defeating the purpose of keeping them secrets. Therefore the need for a code of honour, whether learn it or figure it out, keep it secret. The tricks that professionals don't mind disclosing are in the books, these are copyrighted (to receive royalties from the sales) whereas the tricks by themselves, can't be copyrighted.