updated 12:51 pm EDT, Mon July 15, 2013
Posting breaks NDA
Session videos from June's WWDC 2013 have been posted to an unofficial YouTube channel, reports note. Their unofficial nature has been confirmed by Apple, which issued a statement to iMore. The YouTube copies violate a non-disclosure agreement limiting their content to registered Apple developers.
This year's WWDC marked the first time that Apple made session videos available to all developers on the same day that the events took place. The videos were even available through the official iOS app.