1.  

General Agreement on Tariffs and Trade (GATT 1947)

Article XX - General Exceptions

2.  

Annex 1C: Agreement on Trade-related Aspects of Intellectual Property Rights

Article 27 - Patentable Subject Matter

Article 28 - Rights Conferred

Article 29 - Conditions on Patent Applicants

Article 30 - Exceptions to Rights Conferred

Article 31 - Other Use Without Authorization of the Right Holder

Article 34 - Process Patents: Burden of Proof

Article 65 - Transitional Arrangements

Article 70 - Protection of Existing Subject Matter

3.  

Agreement on Government Procurement

Article VI - Technical Specifications