Alice- There are several ways of getting printed scores--well, melody lines, at least--from the DT. If you download the database, you'll find the songs in SongWright format (archived). MusicEase (shareware) will convert those to printed score.
If you press the shift key when you click on the "play the tune" box when searching on the site, you'll download the MIDI file. Noteworthy Composer (also shareware) will print from MIDI. OR, Alan of Australia's MIDITEXT will convert the MIDI file to ABC; there are many ABC-to-printed scores available as shareware. I'm working on a more-or-less automatic way of doing all this, but it gets complicated, with all the different platforms and formats involved. Meanwhile, it CAN be done, and it's not very difficult.