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The Berne three-step test is a set of constraints on the limitations and exceptions to exclusive rights under national copyright laws.
It was first applied to the exclusive right of reproduction by Article 9(2) of the Berne Convention for the Protection of Literary and Artistic Works in 1967. Since then, it has been transplanted and extended into the TRIPs Agreement, the WIPO Copyright Treaty, the EU Copyright Directive and the WTO dispute settlement panel, involving U.S. copyright exemptions allowing restaurants, bars and shops to play radio and TV broadcasts without paying licensing fees, passed in 1998 as a rider to the Sonny Bono Copyright Term Extension Act) has actually required an interpretation of the test.
The three-step test may prove to be extremely important if any nations attempt to reduce the scope of copyright law, because unless the WTO decides that their modifications comply with the test, such states are likely to face trade sanctions.
TRIPs Article 30, covering limitations and exemptions to patent law, is also derived from the three-step test.