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PROPRIETARY SOFTWARE .
Many of the systems and applications programs used today are proprietary software. This means that someone owns the rights to the program, and the owner expects users to buy their own copies. Microsoft Office is a typical example. If you want to acquire this software to write letters or produce graphics, you must purchase a registered copy in a store, through a mail order house, or over the internet. In buying the software, you pay not to own it, but to acquire a license that makes you an authorized user. Organizations such as businesses and schools, which may need software for use by several people, generally acquire site licenses that allow access by multiple users.

If you buy a copy of Microsoft Office for your own use, you cannot legally make copies of it for your friends, nor can you reproduce parts of the packages 's code to build your own suite program. You cannot eve rent or lease the software to others. You have bought only the right to operate the software yourself and for its intended use creating documents. Parts of the price that you pay for the program becomes profit for the software publisher Microsoft Cooperation for its effort in bringing the product to the marketplace.