Basic Law of the Hong Kong Special Administrative Region/Chapter IX
Chapter IX: Supplementary Provisions
Upon the establishment of the Hong Kong Special Administrative Region, the laws previously in force in Hong Kong shall be adopted as laws of the Region except for those which the Standing Committee of the National People's Congress declares to be in contravention of this Law. If any laws are later discovered to be in contravention of this Law, they shall be amended or cease to have force in accordance with the procedure as prescribed by this Law.
Documents, certificates, contracts, and rights and obligations valid under the laws previously in force in Hong Kong shall continue to be valid and be recognized and protected by the Hong Kong Special Administrative Region, provided that they do not contravene this Law.