I purchased a touch recently and started building up my apps library. After I had started buying/using some of my own, my brother authorized his existing apps for my ipod, so I've begun using his as well. My problem is: the apps authorized by my brother work, but the ones I purchased from the itunes store do not. Same goes with music I purchased long, long ago from the itunes store. I tried authorizing my own computer and my library says that it is; I also restored and re-sync'd my ipod. How can I use my itunes-purchased apps and music?