Sitepoint eBooks Software Used For Creation? Auto Print Customer Email on PDF Too :)?

[itweb2]

The sitepoint eBooks have a great look and feel. What software was used to create them?

Looking to make a Magento eBook and want to use the right program. A great extra feature would be if the software prints the person that bought the eBooks email address on the eBook and they then download it after purchase. Thanks!

[HAWK]

The sitepoint eBooks have a great look and feel. What software was used to create them?

Hey,
Thanks.

The system is custom, but it's based on DocBookXML and XSLT.