The Delving Deeper Reference Rules Hypertext document is online here:
http://ddo.immersiveink.com/dd.html
Credits
Original rules: E. Gary Gygax, Dave Arneson
Preface: Cameron Dubeers
Author/Editor: Simon J. Bull
Production: Simon J. Bull
Proof readers: Ethan Sincox, Peter Fröhlich
Technical Help: Peter Fröhlich, Ramanan Sivaranjan
Delving Deeper title: Mark Allen
License
Published under the OPEN GAME LICENSE Version 1.0a