Fair Dealing is a doctrine of limitations and exceptions to copyright which is found in many of the common law jurisdictions of the Commonwealth of Nations. Fair dealing is an enumerated set of possible defenses against an action for infringement of an exclusive right of copyright. Unlike the related United States doctrine of Fair Use, fair dealing cannot apply to any act which does not fall within one of these categories. In practice, common law courts might rule that actions with a commercial character, which might be naïvely assumed to fall into one of these categories, were in fact infringements of copyright as fair dealing is not as flexible a concept as the American concept of fair use.