An open source license with a patent grant similar to the Microsoft Public License, with the additional condition that any source code for any derived file be provided under this license.
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Microsoft Reciprocal License (Ms-RL)
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) Reciprocal Grants- For any file you distribute that contains code
from the software (in source code or binary format), you must provide
recipients the source code to that file along with a copy of this
license, which license will govern that file. You may license other files
that are entirely your own work and do not contain code from the software
under any terms you choose.
(B) No Trademark License- This license does not grant you rights to use
any contributors' name, logo, or trademarks.
(C) 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.
(D) If you distribute any portion of the software, you must retain all
copyright, patent, trademark, and attribution notices that are present in
the software.
(E) 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.
(F) 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.