请教软件的一个小问题!

jsls

*============================================================================
*             HISTORY
* Below this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
*------------------------------------------------------------------------------
* removed!
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* removed!
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*
* removed!
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* removed!
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* removed!
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* removed!
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* removed!
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* removed!
*
*------------------------------------------------------------------------------
* Upper this line, this part is controlled by PVCS VM. DO NOT MODIFY!!
*====================================================
这是一个软件的开始一些东西,请问它为什么加了这么多个
REMOVED!
这是作什么用的,
小弟是做硬件的,有点看不懂,请高人赐教！