Hi,

> 1. If the referenced file source has the original version statement, we 
> should keep it as it is and cannot replace it with the Apache v2 statement?

Correct.

> 2. If the referenced file source does not have a version statement, but the 
> project of the file has a version statement, do we copy the license statement 
> of the project to the file header?

I would just leave the file as it is.

> 3. Do we still need to indicate which project the source of the document 
> comes from? 
>     such as[9]:
>   /**
>   * Utility for .ini configure file loading.
>   * Copied from <a href="https://github.com/killme2008/Metamorphosis 
> <https://github.com/killme2008/Metamorphosis>">Metamorphosis Project</a>
>   */  

It best to mentioner that in LICENSE, but I see no harm in adding that.

Thanks,
Justin

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