When I plug my iPhone into my PC at home I can transfer music from it to my iTunes library and back again without issue. When I plug the iPhone into my “authorized” work PC the playlist on my iPhone is gray and I cannot touch it. However, I can transfer the small amount of items I purchased thorough the Apple Store. Am I missing something? I know this is DRM, but why?
iPods have a disk mode which allows you to use the iPod as an external hard drive. In that mode, you can listen to songs off the iPod through iTunes on a different computer than you normally sync to. The iPhone does not have the disk mode to allow it to do that.
You are able to transfer your iTunes Store purchases as a backup to another authorized computers (up to a maximum of 5).
iPods have a disk mode which allows you to use the iPod as an external hard drive. In that mode, you can listen to songs off the iPod through iTunes on a different computer than you normally sync to. The iPhone does not have the disk mode to allow it to do that.
You are able to transfer your iTunes Store purchases as a backup to another authorized computers (up to a maximum of 5).
No. The iphone does not have disk mode like the ipod does. That is why you cannot transfer music, other than itunes purchases, from your iphone to your computer.
No, diskmode (for iPods) means you can make it appear like a hard drive when connected to a computer. iPhones do not have this. So only syncing (even manually managed) can only be done with 1 computer. One can transfer "purchased" content to an authorized computer because it knows you bought it thus legal, but other non purchased (not bought from iTunes) it cannot verify you can legally transfer it so it won't allow it.