Microsoft has just posted the text of a new patent "promise not to assert " at its Website, and pledges that it will honor that promise with respect to 35 listed Web Services standards. The promise is similar in most substantive respects to the covenant not to assert patents that it issued last year with respect to its Office 2003 XML Reference Schema, with two important improvements intended to make it more clearly compatible with open source licensing. Those changes are to clarify that the promise not to assert any relevant patents extends to everyone in the distribution chain of a product, from the original vendor through to the end user, and to clarify that the promise covers a partial as well as a full implementation of a standard.
I learned about the new covenant from Microsoft yesterday, which provided me an advance copy of the covenant and the FAQ that accompanies it and an opportunity to ask questions about what it is intended to accomplish. I did have a few requests for clarifications that I'll incorporate below which may resolve some of the questions that might occur to you as well.
Of course, Microsoft (along with IBM and BEA) proposed most, if not all, of these standards to begin with, but I am still impressed with the new covenant, and am pleased to see that Microsoft is expanding its use of what I consider to be a highly desirable tool for facilitating the implementation of open standards, in particular where those standards are of interest to the open source community.