 The 1964 patent for the ENIAC, the world's first general-purpose electronic digital computer, was found both invalid and unenforceable for a variety of reasons thus putting the invention of the electronic digital computer into the public domain.Further, IBM was ruled to have created a monopoly via its 1956 patent-sharing agreement with Sperry-Rand.American antitrust laws did not affect IBM in Europe, where it had fewer competitors and more than 50% market share in almost every country.