Hi there. Send an email to the general email address for the drive "nitpick at javaranch dot com", and it will be forwarded to the correct nitpicker. It would help if you told them in the email when you originally registered and the last assignment you completed. The Cattle Drive registration never expires. I stopped working on the assignments for three years and then became active again in 2013. Welcome back! Margaret.
I’ve looked at a lot of different solutions, and in my humble opinion Aspose is the way to go. Here’s the link: http://aspose.com