Currently Groupdocs. Viewer SDK supports only Text watermark and more advanced features are in Groupdocs.Watermark SDK.
To apply image watermark using Groupdocs. Viewer SDK during rendering is it possible to use Groupdocs.Watermark classes in the viewer SDK methods.
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Yes, you can integrate both APIs together in a single project. But if you have a subscription for GroupDocs.Viewer only, that license will not work for GroupDocs.Watermark API. However, if you have a GroupDocs.Total for .NET license, that will work for both APIs.