In the famous case of Sony Corp.of America v.Universal City Studios,Inc.(1984),the U.S.Supreme Court ruled that the sale of copying equipment does not constitute contributory infringement,provided that it has substantial noninfringing uses.

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This is the exact ruling of the U.S. Supreme court in the case of Sony Corp. of America v. Universal City Studios, Inc. in 1984. The ruling established the "substantial noninfringing uses" doctrine, which basically means that a product or service that has both infringing and noninfringing uses cannot be held liable for contributory infringement as long as there is a significant amount of noninfringing uses.

In the Famous Case of Sony Corp