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POITextSharp - Adding a Watermark; Leaving the PDF editable - FormFlattening = false
 

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    <p>We have a large amount of PDF files that we are creating a web site to allow users to download them and when they do we want to:</p> <ol> <li>Put a watermark on it with their name.</li> <li>We want the form fields to be left open so they can enter their information.</li> <li>We want to be able to print and save the document</li> </ol> <p>When I put the Watermark on the document and then open it I get a message from Adobe:</p> <blockquote> <p>"The document has been changed since it was created and use of extended features is no longer available. Please contact the author..."</p> </blockquote> <p>According the book "iText-in-Action", this is a security issue (Chapter 8). There seems to be 2 ways to open them:</p> <ol> <li>Remove usage rights : This breaks # 3 above.</li> <li>Open it in append mode : It does not matter if modify it and save it with "FormFlattening = false" or true, if I put a water mark on the form the fields are no longer editable.</li> </ol> <p>The error message from Adobe does describe the problem, I have modified the content of the document with the watermark, and the form fields become blocked because of this. I have tried opening the document putting the watermark on it and saving it to a new file, and then closing it. Then reopening it and the trying to unblock the form fields, but it does not work. </p> <p>Does anyone know if this is possible? I have read something about templates; I don't know if this is a solution because of the work to convert the documents to templates? Does anyone know if this would help?</p> <p>Below is a sample of my code for using an Image as a watermark, although I have tried adding text as well:</p> <pre><code> PdfReader reader = new PdfReader(sourceFile.FullName); //reader.RemoveUsageRights(); var fileStream = new FileStream(outputPath, FileMode.Create, FileAccess.ReadWrite); PdfStamper pdfStamper = new PdfStamper(reader, fileStream, '\0', true); Image image = Image.GetInstance(imagePath); image.SetAbsolutePosition(250, 300); for (int i = 1; i &lt;= reader.NumberOfPages; i++) // Must start at 1 because 0 is not an actual page. { PdfContentByte pdfPageContents = pdfStamper.GetUnderContent(i); pdfPageContents.AddImage(image); } pdfStamper.FormFlattening = false; // enable this if you want the PDF flattened. //bool have = pdfStamper.PartialFormFlattening("test"); pdfStamper.Close(); // Always close the stamper or you'll have a 0 byte stream. </code></pre>
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    1. COWell, essentially the usage rights applied to a pdf by adobe products for other adobe products are meant to allow certain operations only, namely form fill-ins. The early variants of such schemes allowed for quite a lot of changes, e.g. they checked merely the first 1000 bytes of the page content. now adobe has learned from its early mistakes and tries to actually only allow the kind of changes originally intended. Thus, even if you find a way to integrate other changes now without breaking reader enabling, e.g. your watermarks, an adobe reader update may break it.
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