Most users of apple technology have to deal with the program iTunes (now on the Mac, its functionality is performed by the Music application and the Finder explorer). It is designed not only for flashing iPhone and iPad, but also for storing your media library, making purchases, listening to music, creating backups, etc.
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If you have one or two computers, there is nothing to worry about. However, if you often have to change work PCs or like to access Apple services (for example, Apple Music) from different places, sooner or later you will have to figure out the authorization and deauthorization of work machines.
The fact is that Apple allows users to connect to one account no more than five computers. This means that you can “link” multiple computers to your account, through which you can access all data from the iTunes Store cloud with downloaded applications, purchased music, as well as Apple Music.
Authorization of the computer will occur during the first actions with the Apple ID account. This can be playing music “from the cloud”, purchasing an application, etc.
Please note that if there are several installed operating systems on the computer, you will need to “link” the PC in each of them.
Apple started all this as part of a program to combat piracy. If the system strictly monitors computers, then everything is not so strict with mobile devices. From here came the general Apple ID accounts and the purchase of applications for one account.
When the limit of five computers has been exhausted and you try to “link” a sixth computer to your account, you will be prompted to “unlink” one of the previously activated ones (you will need to go to iTunes (Music applications on Mac) from it) or reset all computers at once. This is convenient if you are logged in to a friend’s PC that you need to go to, or one of the “linked” PCs is sold or there is no access to it. Together with them, your home or work computer will also be unlinked from Apple ID.
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How to bind (authorize) or unbind (deauthorize) a computer?
Linking a Mac or Windows computer to an Apple ID is easy. To do this, go to the Music app on Mac (iTunes program on Windows) and select “Authorization» → «Authorize this computer…” from the menu “Account”. Please note that the line with menu items has recently been hidden for Windows PC, to display it, press “Alt”.
To unbind the computer from the account, select the item “Deauthorize this computer…” from the same menuAccount”.
To untie all computers at once you need to log in to the Music application (iTunes) through the section Account and then go to the menu View.
Next, click on the “Deauthorize All”, after the necessary computers must be authorized again. Please note that this procedure can be performed no more than once a year. These terms are set out in the Apple User Agreement. Deactivation of all PCs preferably done as a last resort. For example, if a sold or lost computer remains tied, or you need to untie a PC on which the OS was reinstalled.
You can also re-authorize within a year. However, this will have to be done through contacting Apple Support.