Robust PDF editing on the fly

Hello!,

Longtime member, rare poster here.

I am browsing around right now regarding the subject line, and have
looked at the HTML_toPDF project

http://www.rustyparts.com/pdf.php

that also includes a PDFEncryptor
system in it.. but I thought I'd post to the list to see
if anyone has any recommendations or comments.

I'm particularly looking at editing some of the more advanced
security features of PDF (if possible) on-the-fly.. things such as 
limiting printing, encryption etc..

I am building some basic epub sale/distrobution/DRM
features for a client.

TIA for any comments!

Donovan





-- 
D Brooke