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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (Document doc = Document.Load(Utilities.MapSourceFilePath (DocFilePath)))
{
    ImageSearchCriteria imageSearchCriteria = new ImageDctHashSearchCriteria(@"D:\logo.png");
    imageSearchCriteria.MaxDifference = 0.9;

    TextSearchCriteria textSearchCriteria = new TextSearchCriteria("Company Name");

    RotateAngleSearchCriteria rotateAngleSearchCriteria = new RotateAngleSearchCriteria(30, 60);

    SearchCriteria combinedSearchCriteria = imageSearchCriteria.Or(textSearchCriteria).And(rotateAngleSearchCriteria);
    PossibleWatermarkCollection possibleWatermarks = doc.FindWatermarks(combinedSearchCriteria);

}