Office Open XML (OOXML) files were downloaded as part of the Office Open XML ECMA Specification from <http://www.ecma-international.org/publications/standards/Ecma-376.htm>

Copyright - ECMA International, "made available without restriction"
http://www.ecma-international.org/memento/Ecmabylaws.htm - section 9.4

Patent License - Microsoft Open Specification Promise (OSP)
http://www.microsoft.com/interop/osp/