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// For complete examples and data files, please go to https://github.com/groupdocs-watermark/GroupDocs.Watermark-for-.NET
var inputFolder = SourceFolderPath;
var outputFolder = SourceFolderPath + "/output";
var logo = @"D:\logo.png";

var files = Directory.GetFiles(inputFolder);

ImageSearchCriteria imageSearchCriteria = new ImageDctHashSearchCriteria(logo);
var regex = new Regex(@"^Company\sName$", RegexOptions.IgnoreCase);
TextSearchCriteria textSearchCriteria = new TextSearchCriteria(regex);
foreach (var file in files)
{
    try
    {
        using (var doc = Document.Load(file))
        {
            var watermarks = doc.FindWatermarks(textSearchCriteria.Or(imageSearchCriteria));
            watermarks.Clear();
            doc.Save(Path.Combine(outputFolder, Path.GetFileName(file)));
        }
    }
    catch (UnsupportedFileTypeException)
    {
        Console.WriteLine("File format is not supported. File = {0}", Path.GetFileName(file));
    }
}