Mike Marchywka wrote:
>  if you are cooperating with
> the document author, the author could insert placeholders
> or annotation /  logical structure to make this easy.

If you are cooperating with the document author, you can ask him to 
change the source that was used to create the PDF document. That's way 
better than to change the PDF resulting from that source.

> If this is antagonist to original author, if you are trying to 
> make a political satire for example, you could still examine
> the rest of the objects and re-typeset them yourself. 

Too error prone.
For instance: how would your application know that a specific part of 
the content on page 1 is content that needs to be moved to page 2, 
whereas another part of that content is a footer that must remain on 
page 1 (to avoid having a footer somewhere halfway page 2).

Sure, you could to some extent solve this if you keep the structure in 
the PDF (tagged PDF), but still, it's not what PDF was designed for.
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