Split a PDF page

[Andrea Venturoli]

David Kelly wrote:

> Tuning in late has anyone suggested *printing* the PDF to PDF using a
> PDF viewer? Print only the ranges of pages you are interested in. At
> worst print to PS file and then convert PS to PDF.
> 
> I do this fairly often in Preview on MacOS X.

I can easily do that even with ghostscript.
The problem is not that I want to split a document into single pages, 
but that I want to split a page in two.
Someone printed two A4 n-up on an A3; I want the two A4 separated again.

  bye & Thanks
	av.