IPhone 3.0 beta version of the firmware, the user if a mobile phone to pay to remove the software, re-download will be asked to re-purchase. From the client computer and then re-download software to your phone while simultaneously there is no such restriction. In the current version of the iPhone operating system, as long as one-time purchase of software, whether from the computer or iPhone, iPod touch can be an unlimited number of re-download the software. in the new iPhone 3.0 this restriction may seem meaningless, but in fact may be related to the prevention of over-sharing software to download the relevant account.
Apple's DRM copyright protection system allows for a maximum of 5 of the iTunes software on your computer using the same account, to play or use of protected music / software, but does not limit the system to connect these computers the number of mobile devices. However, in the current iPhone software, iPhone to use through the iTunes account and computer simultaneously and can not make its own decisions. This means that, unless the account using the same computer simultaneously, otherwise people can not share iTunes account to use in different iPhone.
In the iPhone 3.0 firmware, the iPhone end users may set up their own iTunes account. If there are no such restrictions prohibit the duplication of download, there is no correlation of the two user accounts can be common. If the user A can download the software after paying a certain section of their account password to the user B, user B can use the account to download the software again.
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