워드 문서에 워터마크를 추가하는 5가지 보안 방법

private static void AddSimpleHeaderWatermark()
{
    Console.WriteLine("Adding simple header watermark...");
    var loadOptions = new WordProcessingLoadOptions();
    using (var watermarker = new Watermarker(InputFile, loadOptions))
    {
        var watermark = new TextWatermark("Confidential", new Font("Arial", 19))
        {
            VerticalAlignment = VerticalAlignment.Center,
            HorizontalAlignment = HorizontalAlignment.Center,
            RotateAngle = 25,
            ForegroundColor = Color.Red,
            Opacity = 0.8
        };
        watermarker.Add(watermark);
        watermarker.Save(Path.Combine(OutputDir, "header_watermark.docx"));
    }
    Console.WriteLine("Header watermark added.");
}

private static void AddTiledWatermark()
{
    Console.WriteLine("Adding tiled watermark...");
    var loadOptions = new WordProcessingLoadOptions();
    using (var watermarker = new Watermarker(InputFile, loadOptions))
    {
        var watermark = new TextWatermark("Protected Document", new Font("Arial", 19))
        {
            VerticalAlignment = VerticalAlignment.Center,
            HorizontalAlignment = HorizontalAlignment.Center,
            RotateAngle = 25,
            ForegroundColor = Color.Red,
            Opacity = 0.9,
            TileOptions = new TileOptions
            {
                LineSpacing = new MeasureValue
                {
                    MeasureType = TileMeasureType.Percent,
                    Value = 12
                },
                WatermarkSpacing = new MeasureValue
                {
                    MeasureType = TileMeasureType.Percent,
                    Value = 12
                }
            }
        };
        var options = new WordProcessingWatermarkSectionOptions
        {
            Name = "TiledShape",
            AlternativeText = "Repeated watermark"
        };
        watermarker.Add(watermark, options);
        watermarker.Save(Path.Combine(OutputDir, "tiled_watermark.docx"));
    }
    Console.WriteLine("Tiled watermark added.");
}

private static void AddImageWatermark()
{    
    using (Watermarker watermarker = new Watermarker(InputFile))
    {
        // Create the image watermark object
        var watermark = new ImageWatermark("logo.png");
        // Configure tile options
        watermark.TileOptions = new TileOptions()
        {
            LineSpacing = new MeasureValue()
            {
                MeasureType = TileMeasureType.Percent,
                Value = 10
            },
            WatermarkSpacing = new MeasureValue()
            {
                MeasureType = TileMeasureType.Percent,
                Value = 8
            },
        };
        // Set watermark properties
        watermark.Opacity = 0.7;
        watermark.RotateAngle = -30;
        // Add watermark
        watermarker.Add(watermark);
        watermarker.Save(Path.Combine(OutputDir, "image_watermark_word.docx"));
    }
} 

private static void AddLockedWatermark_AllowOnlyFormFields()
{
    Console.WriteLine("Adding locked watermark (allow form fields)...");
    using (var watermarker = new Watermarker(InputFile))
    {
        var watermark = new TextWatermark("Do Not Edit", 
        new Font("Arial", 36, FontStyle.Bold | FontStyle.Italic))
        {
            HorizontalAlignment = HorizontalAlignment.Center,
            VerticalAlignment = VerticalAlignment.Center,
            Opacity = 0.4,
            RotateAngle = 45,
            ForegroundColor = Color.Red
        };
        var options = new WordProcessingWatermarkPagesOptions
        {
            IsLocked = true,
            Password = "012345",
            LockType = WordProcessingLockType.AllowOnlyFormFields
        };
        watermarker.Add(watermark, options);
        watermarker.Save(Path.Combine(OutputDir, "locked_allow_form_fields.docx"));
    }
    Console.WriteLine("Locked watermark added (AllowOnlyFormFields).");
}

private static void AddLockedHeaderWatermark()
{
    Console.WriteLine("Adding locked header watermark...");
    var loadOptions = new WordProcessingLoadOptions();
    using (var watermarker = new Watermarker(InputFile, loadOptions))
    {
        var watermark = new TextWatermark("Company Confidential", new Font("Arial", 19))
        {
            VerticalAlignment = VerticalAlignment.Center,
            HorizontalAlignment = HorizontalAlignment.Center,
            RotateAngle = 25,
            ForegroundColor = Color.Red,
            Opacity = 0.8
        };
        var options = new WordProcessingWatermarkSectionOptions
        {
            SectionIndex = 0,
            IsLocked = true,
            Password = "012345",
            LockType = WordProcessingLockType.ReadOnly
        };
        watermarker.Add(watermark, options);
        watermarker.Save(Path.Combine(OutputDir, "locked_header_watermark.docx"));
    }
    Console.WriteLine("Locked header watermark added.");
}