For Approval: Microsoft Public License

[Jon Rosenberg (PBM)]

Microsoft is pleased to submit the Microsoft Public License to the OSI for consideration as an OSI approved license.  This license contains the same terms as the previously submitted Microsoft Permissive License, but has been renamed for greater clarity, and resubmitted in accordance with OSI guidelines.   Microsoft believes that this license provides unique value to the open source community by delivering simplicity, brevity, and permissive reuse terms combined with intellectual property protection.
The three sections below provide the information required for the discussion portion of the approval process.  We look forward to continuing to work with the OSI and the open source community on this submission process.
Jon Rosenberg
Director, Source Program
Microsoft Corporation

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Section  I:  Which OSI licenses are similar and why won't one of those do instead?
Although one can assess similarity of license terms in numerous ways, the MS-PL has similarities to terms in both the New BSD license and Apache 2.0 license.  However, the new BSD license does not contain an explicit patent grant and only implicitly refers to trademark issues.  In addition, we sought to create a license that is simple, short, and easy-to-understand.

Section II: Compatibilities and incompatibilities with other OSI licenses:  Source code distribution breaks down into two areas: Relicensing of MS-PL code and redistribution of MS-PL code with other code that is licensed under a different license.

*         Can MS-PL code be redistributed under a different license?:
No.  The license states that "If you distribute any portion of the software in source code form, you may do so only under this license..."  This restriction is similar to the restriction in the Mozilla Public License that states "You may not offer or impose any terms on any Source Code version that alters or restricts the applicable version of this License or the recipients' rights hereunder."  The MS-PL license explicitly prohibits relicensing of the original licensed code under a different license, regardless of whether the original code is redistributed in whole, in part or as part of a different piece of software.

*         Can MS-PL code be redistributed in combination with other code that is licensed under a different license?
As long as the original MS-PL licensed code is redistributed under the MS-PL license, then the MS-PL  places no restrictions on combining MS-PL code with other code that is licensed under another license.  Licenses that prohibit the distribution of code under any terms other than the terms of that license will not be compatible with the MS-PL.
Section III: The License: A copy of the license is included below and also provided as a .txt file attachment.

Microsoft Public License (Ms-PL)

This license governs use of the accompanying software. If you use the software, you accept this
license. If you do not accept the license, do not use the software.

1. Definitions
The terms "reproduce," "reproduction," "derivative works," and "distribution" have the same meaning here
as under U.S. copyright law.
A "contribution" is the original software, or any additions or changes to the software.
A "contributor" is any person that distributes its contribution under this license.
 "Licensed patents" are a contributor's patent claims that read directly on its contribution.

2. Grant of Rights
(A) Copyright Grant- Subject to the terms of this license, including the license conditions and limitations in
section 3, each contributor grants you a non-exclusive, worldwide, royalty-free copyright license to
reproduce its contribution, prepare derivative works of its contribution, and distribute its contribution or any
derivative works that you create.
(B) Patent Grant- Subject to the terms of this license, including the license conditions and limitations in
section 3, each contributor grants you a non-exclusive, worldwide, royalty-free license under its licensed
patents to make, have made, use, sell, offer for sale, import, and/or otherwise dispose of its contribution in
the software or derivative works of the contribution in the software.

3. Conditions and Limitations
 (A) No Trademark License- This license does not grant you rights to use any contributors' name, logo, or
trademarks.
(B) If you bring a patent claim against any contributor over patents that you claim are infringed by the
software, your patent license from such contributor to the software ends automatically.
(C) If you distribute any portion of the software, you must retain all copyright, patent, trademark, and
attribution notices that are present in the software.
(D) If you distribute any portion of the software in source code form, you may do so only under this license
by including a complete copy of this license with your distribution. If you distribute any portion of the
software in compiled or object code form, you may only do so under a license that complies with this
license.
(E) The software is licensed "as-is." You bear the risk of using it. The contributors give no express
warranties, guarantees or conditions. You may have additional consumer rights under your local laws which
this license cannot change. To the extent permitted under your local laws, the contributors exclude the
implied warranties of merchantability, fitness for a particular purpose and non-infringement.

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