In 2007, some 30 open source software companies were purchased for more than $1 billion —double the number of sales in 2005, according to consulting firm 451 Group.

根据451咨询集团的说法，2007年，约有30家开源公司被收购，总价值超过10亿美金，这比2005年的数据翻了一番。

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"Those executives are most likely not revealing their high-end costs, " says Bruce Alexander, president of executive protection consulting firm All Source Consulting Group.

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