A recipe may be subject to copyright protection or "trade secret" protection depending on how it has bee used. Any original writing obains basic copyright protections as soon as written (even if it does not have full U.S. legal protection as a federal copyright. That protection may extend to keeping others from making or using such original work without permission. If a person has used their own recipe for their own business and another copies it for use in their business then there may be a potential claim for a violation of a trade secret, depending on certain facts involved.
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