5.1.1. Introduction (informative)
ICT has closed functionality for many reasons, including design or policy. Some of the functionality of products can be closed because the product is self-contained and users are precluded from adding peripherals or software in order to access that functionality.
ICT may have closed functionality in practice even though the ICT was not designed, developed or supplied to be closed.
Computers that do not allow end-users to adjust settings or install software are functionally closed.
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