Remove

public void Remove(PossibleWatermark possibleWatermark)

using (Watermarker watermarker = new Watermarker(@"D:\input.doc"))
{
    ImageSearchCriteria imageSearchCriteria = new ImageDctHashSearchCriteria(@"D:\logo.png");
    Regex regex = new Regex(@"^Company\sName$", RegexOptions.IgnoreCase);
    TextSearchCriteria textSearchCriteria = new TextSearchCriteria(regex);
    PossibleWatermarkCollection watermarks = watermarker.Search(textSearchCriteria.Or(imageSearchCriteria));
    if (watermarks.Count > 0)
    {
        watermarker.Remove(watermarks[0]);
    }

    watermarker.Save(@"D:\output.doc");
}

public void Remove(PossibleWatermarkCollection possibleWatermarks)

using (Watermarker watermarker = new Watermarker(@"D:\input.doc"))
{
    ImageSearchCriteria imageSearchCriteria = new ImageDctHashSearchCriteria(@"D:\logo.png");
    Regex regex = new Regex(@"^Company\sName$", RegexOptions.IgnoreCase);
    TextSearchCriteria textSearchCriteria = new TextSearchCriteria(regex);
    PossibleWatermarkCollection watermarks = watermarker.Search(textSearchCriteria.Or(imageSearchCriteria));
    watermarker.Remove(watermarks);
    watermarker.Save(@"D:\output.doc");
}