Earlier quoted context omitted.
"One user may install and use copies of the software to design, develop, test and demonstrate your programs. You may not use the software on a server in a production environment." License: http://www.microsoft.com/web/webpi/eula/windows_runtime_ocr_...
Ouch. I was not aware of this, so thanks for the info! I guess the reason for this surprisingly restrictive license is/was the version 1/first release character of the software (namespace Windows"Preview".Media.Ocr). The good news: In Win 10 the separate library is gone and the OCR feature is a regular part of Windows (Windows.Media.Ocr namespace). Along with this, the separate OCR runtime license is gone. -> I could…
Update: I confirmed that Microsoft's OCR.dll is indeed part of Windows Server 2016. More info: http://blog.a9t9.com/2015/10/microsoft-ocr-on-windows-server...