Watermarker

public Watermarker(string filePath)

// Load a content from a file.
using (Watermarker watermarker = new Watermarker("D:\\input.pdf"))
{
    // Use methods of Watermarker class to add, search or remove watermarks.

    // Save the document.
    watermarker.Save("D:\\output.pdf");
}

public Watermarker(string filePath, LoadOptions options)

PdfLoadOptions loadOptions = new PdfLoadOptions();
loadOptions.Password = "123";
using (Watermarker watermarker = new Watermarker(@"C:\Documents\test.pdf", loadOptions))
{
    // ...
}

public Watermarker(string filePath, WatermarkerSettings settings)

WatermarkerSettings settings = new WatermarkerSettings();
settings.SearchableObjects = new SearchableObjects
{
    WordProcessingSearchableObjects = WordProcessingSearchableObjects.Hyperlinks
                                    | WordProcessingSearchableObjects.Text,
    SpreadsheetSearchableObjects = SpreadsheetSearchableObjects.HeadersFooters,
    PresentationSearchableObjects = PresentationSearchableObjects.SlidesBackgrounds
                                  | PresentationSearchableObjects.Shapes,
    DiagramSearchableObjects = DiagramSearchableObjects.None,
    PdfSearchableObjects = PdfSearchableObjects.All
};

foreach (string file in Directory.GetFiles(@"D:\files"))
{
    using (Watermarker watermarker = new Watermarker(file, settings))
    {
        PossibleWatermarkCollection watermarks = watermarker.Search();

        // The code for working with found watermarks goes here.
    }
}

public Watermarker(string filePath, LoadOptions options, WatermarkerSettings settings)

WatermarkerSettings settings = new WatermarkerSettings();
settings.SearchableObjects = new SearchableObjects
{
    EmailSearchableObjects = EmailSearchableObjects.Subject
                           | EmailSearchableObjects.HtmlBody
                           | EmailSearchableObjects.PlainTextBody
};
EmailLoadOptions loadOptions = new EmailLoadOptions();
using (Watermarker watermarker = new Watermarker(@"D:\test.msg", loadOptions, settings))
{
    SearchCriteria criteria = new TextSearchCriteria("test", false);
    // Note, search is performed only if you pass TextSearchCriteria instance to Search method
    PossibleWatermarkCollection watermarks = watermarker.Search(criteria);
    // Remove found text fragments
    watermarks.Clear();
    // Save changes
    watermarker.Save();
}

public Watermarker(Stream document)

// Load a content from a stream.
using (FileStream inputStream = File.Open("D:\\input.pdf", FileMode.Open))
using (FileStream outputStream = File.Open("D:\\output.pdf", FileMode.Create))
using (Watermarker watermarker = new Watermarker(inputStream))
{
    // Use methods of Watermarker class to add, search or remove watermarks.

    // Save changes.
    watermarker.Save(outputStream);
}

public Watermarker(Stream document, LoadOptions options)

PdfLoadOptions loadOptions = new PdfLoadOptions();
loadOptions.Password = "123";
using (FileStream fileStream = File.Open(@"C:\Documents\test.pdf", FileMode.Open))
using (Watermarker watermarker = new Watermarker(fileStream, loadOptions))
{
    // ...
}

public Watermarker(Stream document, WatermarkerSettings settings)

WatermarkerSettings settings = new WatermarkerSettings();
settings.SearchableObjects = new SearchableObjects
{
    WordProcessingSearchableObjects = WordProcessingSearchableObjects.Hyperlinks
                                    | WordProcessingSearchableObjects.Text,
    SpreadsheetSearchableObjects = SpreadsheetSearchableObjects.HeadersFooters,
    PresentationSearchableObjects = PresentationSearchableObjects.SlidesBackgrounds
                                  | PresentationSearchableObjects.Shapes,
    DiagramSearchableObjects = DiagramSearchableObjects.None,
    PdfSearchableObjects = PdfSearchableObjects.All
};

foreach (string file in Directory.GetFiles(@"D:\files"))
{
    using (FileStream fileStream = File.Open(file, FileMode.Open))
    using (Watermarker watermarker = new Watermarker(fileStream, settings))
    {
        PossibleWatermarkCollection watermarks = watermarker.Search();

        // The code for working with found watermarks goes here.
    }
}

public Watermarker(Stream document, LoadOptions options, WatermarkerSettings settings)

WatermarkerSettings settings = new WatermarkerSettings();
settings.SearchableObjects = new SearchableObjects
{
    EmailSearchableObjects = EmailSearchableObjects.Subject
                           | EmailSearchableObjects.HtmlBody
                           | EmailSearchableObjects.PlainTextBody
};
EmailLoadOptions loadOptions = new EmailLoadOptions();
using (FileStream fileStream = File.Open(@"D:\test.msg", FileMode.Open))
using (Watermarker watermarker = new Watermarker(fileStream, loadOptions, settings))
{
    SearchCriteria criteria = new TextSearchCriteria("test", false);
    // Note, search is performed only if you pass TextSearchCriteria instance to Search method
    PossibleWatermarkCollection watermarks = watermarker.Search(criteria);
    // Remove found text fragments
    watermarks.Clear();
    // Save changes
    watermarker.Save();
}