Songs won't download from itunes

i recomend using a program called disk aid to copy all your music off your ipod to a foldert that you specif on your computer then restore your ipod using itunes and then put the song you copy back on the reason you get that message is because apple is srick about sharing usic a dosnt allow that so ipods unloess they been messed with with 3rd party software cant sinc with multiple itunes here is the program it is a 14 day trial but will get all your music here is the url http://www.digidna.net/diskaid/download.php tip to get it to dipaly your ipod folders in the progams buttom left hand cornor you should see a drop down arrorw click that and select a floder it should display your ipods content hope this helps

I want to trans fer songs I bought from itunes to my ipod nano, How do I do this?