Apple, Microsoft and Sony all compete with proprietary systems.

苹果、微软与索尼都在就专有系统进行竞争。

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On top of this are the various proprietary systems that combine to form OS X.

在这之上，则是各种不同的专有系统，组合在一起构成了Mac OS X。

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Microsoft remains the major power in the enterprise. Its future is in proprietary systems.

微软仍是企业界的首选，他的前途在于其专利系统。

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Most of the large firms have built their own proprietary systems to manage their own algorithms.

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The SUSE Linux enterprise computing platform allows for high interoperability between open source and proprietary systems.

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But when other companies, including Apple, have developed proprietary systems, none has succeeded for long.

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