Third party notices

[aguzev]

Toolkit contains two DLLs supplied by Microsoft under MIT license. Does it require a notice in the source code or module descriptions?

• DocumentFormat.OpenXml
• System.IO.Packaging

[mikenelson-io]

Yes, we need to include the MIT license. We can add it as part of the comment headers of the module or as a separate file. I would suggest adding it as a separate file as we do with the SDKv2. If we add it as a file, we need to note in the module comment headers what DLL references that license.