Here are the currently surviving talks from DEF CON 4. If I get more recovered I'll post them here.
Here is the RSS feed to the complete collection below:
https://www.defcon.org/podcast/defcon-4-audio.rss
DEFCON 4 Hacking Conference Presentation By Attitude Adjuster https://media.defcon.org/dc-4/audio/...on - Audio.m4b
DEFCON 4 Hacking Conference Presentation By Emmanuel Goldstein - (panel) The EFF needs to help Hackers https://media.defcon.org/dc-4/audio/...rs - Audio.m4b
DEFCON 4 Hacking Conference Presentation By Hack the Lies was created to give a voice to the once silent hacker community https://media.defcon.org/dc-4/audio/...ty - Audio.m4b
DEFCON 4 Hacking Conference Presentation By Ira Winkler - If you want to do what I do https://media.defcon.org/dc-4/audio/...do - Audio.m4b
DEFCON 4 Hacking Conference Presentation By John Q. Newman - Identity and Privacy https://media.defcon.org/dc-4/audio/...cy - Audio.m4b
DEFCON 4 Hacking Conference Presentation By Joker - The Joke https://media.defcon.org/dc-4/audio/...ke - Audio.m4b
DEFCON 4 Hacking Conference Presentation By Richard Thieme - The symbiotic relationship between networked computers and humans https://media.defcon.org/dc-4/audio/...ns - Audio.m4b
DEFCON 4 Hacking Conference Presentation By Stephen Cobb - Hacking and Train Spotting https://media.defcon.org/dc-4/audio/...ng - Audio.m4b
DEFCON 4 Hacking Conference Presentation By The Institution - Calling for the creation of the Institution https://media.defcon.org/dc-4/audio/...on - Audio.m4b