The link to "Recorded presentation" at http://dev.day.com/content/ddc/en/gems/aem-architecture.html is down and couldn't find a way to report it.
Any idea on who to contact to get it fixed?
I have notified the respective team & are looking into it. Sorry for any inconvience caused. Hopefully will be fixed soon.
Till the issue is resolved The cq gems page has been updated with non gated recording links so that you can watch the sessions.