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In the law of contracts, revocation is a type of remedy for buyers when the buyer accepts a nonconforming good from the seller. Upon receiving the nonconforming good, the buyer may choose to accept it despite the nonconformity, reject it (although this may not be allowed under the perfect tender rule and whether the Seller still has time to cure), or revoke their acceptance. Under Article 2 of the Uniform Commercial Code, for a buyer to revoke, he must show (1) the goods failed to conform to the contract and (2) it substantially impaired the value of the goods (this is a question of fact).
If the buyer knew of the nonconformity at the time of acceptance, he can revoke only if he can show he accepted the goods with the impression the seller would cure it and that did not happen. If he did not know of the nonconformity at acceptance, he can revoke only if he can prove he was reasonably induced by the difficulty of discovering the defect or by the seller's assurances. The buyer can revoke if (1) it occurs within a reasonable time after the buyer discovers or should have discovered; (2) before any substantial change in the goods not caused by their own defects; and (3) not effective until the buyer notifies the seller he is going to revoke. Upon revocation, the buyer can then cancel the contract and compel refund of the purchase price of the goods. In some states, the courts allow the seller to set off the price for the time the buyer kept the goods before the revocation.
In canon law, grants, laws, contracts, sentences, jurisdiction, and appointments are at times revoked by the grantor, his successor or superior according to the prescriptions of law. Revocation without just cause is illicit though often valid. Laws and customs are revoked when, owing to change of circumstances, they cease to be just and reasonable.