[NTG-context] issue with signature field

Dear list, some time ago, Hans implemented signature fields: \setupinteraction[state=start] \starttext \definefield[x][signature] \field[x] \stoptext I’m afraid I’m not able to sign it using Acrobat 9.5.5, which is the latest version released for Linux. Acrobat Reader 9.5.5 is able to sign this document: https://bugs.ghostscript.com/attachment.cgi?id=11678 (and https://bugs.ghostscript.com/attachment.cgi?id=11707). I guess it may not be the cause, but which is the way to force the document to be written in PDF version 1.6? Many thanks for your help, Pablo -- http://www.ousia.tk