Fwd: How do I embed fonts in a PDF?

---------- Forwarded message ----------
From: Sheldon Plankton <>
Date: Sep 14, 2007 11:15 PM

Subject: How do I embed fonts in a PDF?
To: 

Hi,

I generated my PDF book with docbook and tried to upload it to 
lulu.com.
Lulu.com
 reject my upload stating that ...

Your document could not be created: This font is not embedded: Helvetica-Bold (
How do I embed fonts?)
This font is not embedded: Helvetica (
How do I embed fonts?)
This font is not embedded: Times-Roman (
How do I embed fonts?)

... what are they talking about and what can I do in my custom style sheet to fix it?

Thanks
Plankton