These projects (and the corresponding source files and DLLs) are under the MIT license:
SDRSharp.csproj
SDRSharp.CollapsiblePanel.csproj
SDRSharp.PanView.csproj
SDRSharp.SoftRock.csproj
SDRSharp.FUNcube.csproj
SDRSharp.RTLSDR.csproj
SDRSharp.SDRIQ.csproj

This project (and the corresponding source files and DLLs) is under the MS-RSL license:
SDRSharp.Radio.csproj