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We have class library MyFirm.Business that use CoreLab.MySql.
We use this library in our WinForm UI MyFirm.BusinessExplorer with license file in resources and it works fine.

Sometime we have to use this library in other configuration. We have class library MyFirm.COMExcel exposing COM interface to Excel extension functions.

Excel use MyFirm.COMExcel that use MyFirm.Business and finally use CoreLab.MySql. In this configuration we have trouble with licensing. How we can resolve this trouble?

In MySQLDirect .NET 3.50 Beta COM objects licensing is supported. Licensing resource must be in the COM object file. Check if you can use this version of our product.