Hello, We've been experimenting with an add-on site and have got things working apart from the code signing. We've watched the video (http://www.oxygenxml.com/demo/AddonsSupport.html) and think it suggests that it's the .zip file rather than the .jar which is signed? (There's a screen at 4:00 mins with: "2: Digitally sign the archive") I've tried using google to research signing zip files but it's leading me to signing systems for Android applications (usually running on Android). Do you have any hints/suggestions for signing? (We've got codesigning key/certificates in .cert, .p12, .pem formats and in a Java keystore). Thanks, Nigel -- Nigel Whitaker, Software Architect, DeltaXML Ltd. "Experts in information change" nigel.whitaker@deltaxml.com http://www.deltaxml.com +44 1684 869035 Registered in England: 02528681 Reg. Office: Monsell House, WR8 0QN, UK