Authorizing Itunes

I created a slideshow in Iphoto. When I try to add music from Itunes that I purchased, it keeps prompting me for authorization. So I enter password and it still does not work. When I try to use a song I wrote and uploaded, or got from a cd, no problem. Am I missing something here.

these may be of some help

http://docs.info.apple.com/article.html?artnum=165204

http://docs.info.apple.com/article.html?artnum=93014

http://docs.info.apple.com/article.html?artnum=93035

The problem is that the music you have purchased is protected, the music you have ripped or created is not.

The workaround is to select the songs you wish to use in your slideshow in iTunes, burn them to a CD, then import them.

If you're going to burn this to DVD another tip would be that some people find that the first song in a slideshow plays, but then the music stops. To get around this you need to combine the songs into one in iTunes, export to CD, import back into iTunes.