Proprietary software is distributed under licences that grant limited rights to end users while retaining ownership with the vendor. Users typically cannot access or alter the source code and must follow specific usage conditions. This model allows companies to monetise and control their software products. Hence, the description given matches proprietary software.
Option A:
Option A is correct because proprietary refers to software that is privately owned and controlled, with restrictions on copying, sharing and modifying. Educational institutions often use proprietary office suites and specialised software under such licences.
Option B:
Option B, open source, allows code modification and redistribution, which contradicts the strict restrictions mentioned in the stem. It represents a different philosophy of software distribution.
Option C:
Option C, public domain, denotes works whose rights have expired or been waived, allowing free use and modification without restriction. This is not the case described.
Option D:
Option D, freeware, may be free to use but is frequently still proprietary in terms of source code and may not allow modification or redistribution. It does not fully express the ownership and control aspects indicated.
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