Steve Jobs was a frequent guest over the years at the D: All Things Digital events – six times, to be precise, from 2003 to 2010. Now they’ve assembled video and audio podcasts of his appearances in a single place for you to download, if it interests you.
Steve Jobs D: All Things Digital appearances available for download
“We thank Apple for its cooperation in making these videos available.”
So Apple was preventing them from being released in the past. That probably answers my question as to why Tim Cook’s session at D10 wasn’t live streamed like others were – Apple wouldn’t let it.