Re: re-generate the PDF with standard non-embedded fonts

no  these  original pdf files are coming from other places, which out of my  control. if some character use a embedding font ,i want to these characters using  standard fonts  instead of embedding font 
------------------ Original ------------------
From:  "Ken Sharp"<[email protected]>;
Date:  Tue, Oct 11, 2016 10:44 PM
To:  "王海生-软件研发部"<[email protected]>; 
Cc:  "gs-devel"<[email protected]>; 
Subject:  Re: [gs-devel] re-generate the PDF with standard non-embedded fonts

 
At 22:23 11/10/2016 +0800, =?utf-8?B?546L5rW355SfLei9r+S7tueglOWPkemDqA==?= 
wrote:

>i got thousands of pdf files ,many of them have a few embedding fonts,can 
>i transform orginal pdf to a new one ,all the texts or characters are 
>using one of the 5 standard font families(Times, Helvetica, Courier, 
>Symbol and ZapfDingbats.)
>
>can gs do this kind of thing?how ??

Its not clear to me exactly what you are asking for.

If you run an existing PDF file through Ghostscritp and produce an 
equivalent PDF file using the pdfwrite device, then any fonts embedded in 
the original will be retained. Missing fonts will have substitutes created 
and embedded. The resulting PDF file will contain all required fonts but 
some will be substitutes for the originally requested fonts.

You cannot replace the fonts embedded in the document with substitutes, 
because the resulting PDF file will be degraded in quality when compared to 
the original.

>from http://www.aivosto.com/vbtips/pdf-optimize.html

This doesn't clarify your question.