Legal basis: Article 497 of the General Principles of the Civil Law of People's Republic of China (PRC) is invalid under any of the following circumstances: (1) It is invalid according to the provisions of Section 3 of Chapter VI of Part I of this Law and Article 506; (2) The party providing the standard terms unreasonably exempts or lightens its responsibilities, aggravates the responsibilities of the other party or restricts the main rights of the other party; (3) The party providing the standard terms excludes the other party's main rights.