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It doesnt matter if you have a trademark or not. There is this thing called common law. Basically, for example, if you found out pepsi wasn't trademarked and went and trademarked it, and then told pepsi they cant sell it anymore because you trademarked it, They would sue you and most likely win because they have been selling pepsi and doing business for much longer than you.
Basically, if you didnt come up with the idea, a trademark is worthless.
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