Microsoft extends access to C#, CLI

C# and CLI are now covered by Microsoft's Community Promise, enabling open source usage of the technologies without fear of reprisals

By Paul Krill, InfoWorld, 07/07/09

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Microsoft is extending its "Community Promise" patent licensing to C# programs and Common Language Infrastructure (CLI), enabling open source usage of the technologies without fear of any reprisals.

With Community Promise, Microsoft assures it will not assert its "Necessary Claims" against anyone who makes, uses, sells, offers for sale, imports, or distributes any "Covered Implementation" under any development or distribution model, said Peter Galli, Microsoft open source community manager, in a blog post on Monday. This includes open-source licensing models such as the LGPL or GPL, he said.

[ Related: Microsoft in 2006 promised not to take patent-enforcing action against those using certain APIs. | Keep up with app dev issues and trends with InfoWorld's Fatal Exception and Strategic Developer blogs. ]

The company, Galli said, will apply Community Promise to the ECMA 334 and 335 specifications. ECMA 334 specifies the form and establishes the interpretation of programs written in the C# language. ECMA 335 is a standard that defines the CLI, in which applications written in multiple high-level languages can be executed in different system environments without having to rewrite the applications to consider unique characteristics of those environments.

"It is important to note that under the Community Promise anyone can freely implement these specifications with their technology, code, and solutions," Galli said. "You do not need to sign a license agreement or otherwise communicate to Microsoft how you will implement the specifications."

Community Promise applies to developers, distributors, and users of covered implementations without regard to the development model used to create the implementations. The type of copyright license used to distribute software covered by Community Promise also does not matter.

"The Community Promise is an excellent vehicle and, in this situation, ensures the best balance of interoperability and flexibility for developers," said Scott Guthrie, Microsoft corporate vice prresident for the .Net Developer Platform, in a statement included on Galli's blog.

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