drm removal from dcf. extension files

In my search for info/help on drm removal i came upon this forum and i hope someone here can answer my questions. I have a Sony Ericsson mobile phone with several drm protected files programmed on it. They have a dcf. extension, which i by now understand to be the drm content format extension. I tried to remove the drm protection with sound taxi 1.0 but that program doesn?t recognize the dcf extension. I have no intention to illegally distribute the files or anything, i just like to save them on my computer for safekeeping. They are not just audiofiles btw, i also have a video and two images. Does anyone know how i can remove the drm protection so i can transport the files to my computer and possibly convert them so i can watch/listen with wmplayer?
Thank you