Learn how to add secure watermarks to Word documents using GroupDocs.Watermark for .NET. Compare 5 protection methods with code examples, including locked headers, tiled watermarks, and password-protected sections that can't be easily removed....Learn how to add secure watermarks to Word documents using GroupDocs.Watermark for .NET. Compare 5 protection methods with code examples, including locked headers, tiled watermarks, and password-protected sections that can't be easily removed.