Hello,
Working with documents that contain sensible data, I wanted to display all
the information on the screen, but hide some parts of the docs when printing
them. I implemented that by importing the original pages and generating new
docs with OCG, that would not show, but overprint (and hide) the desired
information, as the following code suggests:
PdfContentByte cb = writer.DirectContent;
while (i < number_of_pages)
{
document.NewPage(); // copy the page in
the new doc
PdfImportedPage page1 = writer.GetImportedPage(reader, i);
cb.AddTemplate(page1, 1f, 0, 0, 1f, 0, 0);
PdfLayer layer = new PdfLayer("layer", writer); // add a new
layer
layer.SetPrint("Print", true); // that
overprints
layer.OnPanel = false; // but is
not in panel
layer.On = false; // nor
displayed
cb.BeginLayer(layer);
cb.AddImage(jpeg); // image
overprinting
// ...extra contents here
cb.EndLayer();
}
For security, the OCG (layer) is not displayed in the layers panel of
Acrobat, and can´t be accessed or modified.
The question now is: is there a way, with iText, of accessing/modifying this
OCG ?
Thanks,
Ignacio
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