I've used Hofa's "CD-Burn & DDP" creator for a couple of years. While not the most intuitive piece of software I've ever used, it does the job of creating DDP files at an extremely reasonable price. (They have a player for 12 Euro too, which I've suggested that several clients purchase.) When I've found bugs, they've been extremely responsive... until the last one, which was relatively inconsequential. I now understand why - they've just announced a new version, which of course is a paid upgrade. Well, everyone has to eat.