Proprietary Tyrants
Other examples of proprietary malwareA tyrant device is one that refuses to allow users to install a different operating system or a modified operating system. These devices have measures to block execution of anything other than the “approved” system versions. We also refer to this practice as tivoization.
Apple arbitrarily blocks users from installing old versions of iOS.
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The Apple iThings are tyrant devices. There is a port of Android to the iThings, but installing it requires finding a bug or “exploit” to make it possible to install a different system.
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Some Android phones are tyrants (though someone found a way to crack the restriction). Fortunately, most Android devices are not tyrants.