'DVD' Jon Lech Johansen has been having a few more run-ins with Apple this month over his doubleTwist application, posting a subpoena he's received from the Cupertino giant on his blog.

DoubleTwist is an iTunes style media player, described as "an attempt to open up 200 gadgets and obsessively test every single one of them with doubleTwist while sending stuff to each other and to our friends and families around the world."

While DVD Jon has a long history of reverse engineering digital media security, doubleTwist is a perfectly legitimate software application that makes it easy to manage media files for a variety of hardware devices. It’s sort of like iTunes, except it works for nearly any device — not just your iPod and iPhone (you can find an extensive overview here, and the app now supports both Windows and Mac). Given that one of the iPod’s biggest advantages over competitors is the seamless experience it offers to users, Apple probably isn’t a big fan.