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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
using (PdfDocument doc = Document.Load<PdfDocument>(Utilities.MapSourceFilePath (FilePath)))
{
    // Initialize search criteria
    ImageSearchCriteria imageSearchCriteria = new ImageDctHashSearchCriteria(@"D:\logo.png");
    TextSearchCriteria textSearchCriteria = new TextSearchCriteria("Company Name");

    PossibleWatermarkCollection possibleWatermarks = doc.Pages[0].FindWatermarks(imageSearchCriteria.Or(textSearchCriteria));

    // Remove all found watermarks
    for (var i = possibleWatermarks.Count - 1; i >= 0; i--)
    {
        possibleWatermarks.RemoveAt(i);
    }

    doc.Save();
}