We were using http://www.ujihara.jp/iTextdotNET/itext.dtd as our DOCTYPE
in all our XML files which is actually a bad practice. We did not know it until our PDF generations failed since the site went down for some reason.
Any suggestions on where I could find the same dtd file? We would need to download and locally host it. Tried Google search caches, but could not find the dtd file.