No company has been able to deliver a comprehensive alternative to the leading proprietary OS.
尚无任何公司可提供能够替代主流专属操作系统的综合备选方案。
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。
Given the cost associated with building an OS like Linux, one wonders if proprietary companies will ever go it alone again.
考虑到与建立一个类似Linux的操作系统相关的费用，人们不禁要问，究竟这些控股公司是否又要单干了。
The COTS vendor then brings out an Xtra Proprietary version of its OS, which contains a client that USES XML signatures (and only XML signatures) for security.
然后，COTS供应商生产出其OS的Xtra专用版，它包括了将XML签名(和只有XML签名)用于安全性的客户端。
The COTS vendor then brings out an Xtra Proprietary version of its OS, which contains a client that USES XML signatures (and only XML signatures) for security.
然后，COTS供应商生产出其OS的Xtra专用版，它包括了将XML签名(和只有XML签名)用于安全性的客户端。
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