Here´s a good suggestion. I haven´t tried it but maybe this will help someone out:
Play iTunes Purchases on Any Music Player
Difficulty: Moderate; Time: 30 minutes
Here’s how to make music you bought via iTunes play on any media player. Like the other hack on this page, this DRM-stripping trick could get you into legal hot water, but it also gives you control over songs that you rightfully own.
I recommend using myFairTunes to set iTunes downloads free. You’ll also need to use an older version of iTunes (and yes, give up some features), because this utility strips tracks of their copy protection, and Apple regularly updates iTunes software so hackers can’t remove the DRM. Search online for “Old iTunes 7.4.1 download” and “myFairTunes7 download” to find the two applications.
If you’re already running iTunes, choose Store, Deauthorize Computer, and then close the program. Temporarily rename the iTunes folder something simple like ‘iTunes Recent’. Uninstall iTunes, and then restart the PC.
Install iTunes 7.4.1 and myFairTunes7. Next, install Visual C++ SP1 and .Net Framework 2.0. Restart your PC, and launch iTunes. Import your DRM-loaded songs, and play one of them. Enter your iTunes Music Store account information when prompted to do so.
Launch myFairTunes7. Click the check boxes for Preserve RAW AAC Stream and Enable “No Sound” Fast Dump. If you’d like to create MP3 files instead of using the original AAC files, click that box. With the songs selected, click Start Conversion. The software will take about 15 seconds per song to remove the DRM.
Go back to iTunes and drag all of the converted files from iTunes into a new folder in your desktop. The songs should now be playable on any audio device.
Source: Zack Stern at http://www.computerworld.com/action/article.do?command=viewArticleBasic&taxonomyName=Hardware&articleId=9114170&taxonomyId=12&pageNumber=1