Here's a way to put protected AAC files on your 650 so you can play them on Real Player:
1. Create a CD with the songs you want to put on your 650. Now they will be on a CD in AIFF format.
2. Convert the AIFF CD songs to MP3 using a converter program. I use Sound Converter available at
http://www.dekorte.com/software/osx/SoundConverter
3. Download the MP3 files to the SD card on your 650 using your favorite sync software - I use HotSync that came with the 650 Palm Desktop.
Once they are on your SD card, Real Player knows them.
Copyright info: I am not an IP lawyer, but *** long as you don't give the MP3 files to any one you are probably OK to bypass the Apple AAC protection so that you can use them on your 650.