Ok, I.D. = ID, right?
(I'm not good on all this short hand stuff). . . Regardless, you should not worry about such things it us up to YOU and how YOU present an effect. Not only will you find multiple ways of pulling off the ID, there are many different modes of approach when it comes to presentation. Just your personality can and most likely will shift public perception, even how you're feeling that day will affect such things.
Many around here complain because I emphasize the difference in doing "tricks" vs. creating "magic". . . the latter happens when you learn how to take that "stock" bit of business and give the audience an "experience" that is unlike the more typical mode in which a thing is done. My favorite example of this is the little Bird Cage of Blackstone fame; for generations everyone that did this effect replicated the Blackstone handling in which the thing vanishes in an instant. But then we come into the 1980's and Billy McComb presenting the same little cage with a novel storyline. Rather than the instant vanish we are used to seeing he makes the thing dissolve beneath a translucent silk hank -- it's still one of the most enchanting effects I've ever witnessed, the presentation of a popular commercial prop that I've own at least a half-dozen of through the years (they do break when used @ high volume).
Look at the Cups & Balls, one of the oldest known effects in magic and yet, no two performers present them in the same way. This is one of those effects that can be found in nearly every child's magic kit sat on a department store's shelf during the Christmas season and so, it is "known", yet those of us that really get vested into the deeper mechanics of the piece not only make the method vanish and seem improbably, we are able to bewilder even the most educated amongst us.
Don't fear the idea that just anyone can go out and buy a trick you do in your act, very few will and out of that group, fewer yet will ever learn how to actually perform it in a manner that's entertaining and thus, a challenge to you. But at the same time understand that your challenge is to develop a mode of demonstration, perhaps even using a different method, so that you stand out as the exception. For an example, if you have a magic shop pushing that particular gaff, you could present Eddie Joseph's PREMONITION or one of its variants instead. You're still dealing with a called out card though the effect is slightly different (if you go with the standard bit).
Yes, it means footwork and research and yes, it may mean having to buy or borrow books that will give you insight to such alternatives. At the end of the day however, you will find yourself more competent, better educated and thus, better able to counter such situations in a creative and "professional" manner.
