Attached is a participant release form (PDF). Here's the content:
Code4Lib 2010 Conference Participant Release
I agree to allow my participation in the Code4Lib Conference to be electronically recorded.
I understand that any resulting products may be made available on the web as part of the Code4Lib conference proceedings (on the Code4Lib website http://www.code4lib.org/ , Internet Archive, or other hosting service), under the Creative Commons Attribution-NonCommercial-ShareAlike 3.0 License (http://creativecommons.org/licenses/by-nc-sa/3.0/ ).