@PradB, before asking how to make sure others will not copy, are you sure you have not copied someone else's idea ? Most people think their idea is a very original one and will make billions like facebook but that is almost never the case. If your idea can be executed in 1 week's time, either your idea is junk or you have not worked out the details
Even a paan dukan(shop) or tea stall will take much more time and effort to establish
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