Are you sure? There were no comments in the videos, or the notes, for instance?

waterlesscloud · on Dec 9, 2014

In a wide range of videos and notes that have been online for years? Seriously doubtful.

lsiebert · on Dec 9, 2014

Well the material is covered by http://ocw.mit.edu/help/faq-intellectual-property/ so it presumably can be redistributed. A quick google search reviews a number of mirror sites, several of which ( http://ocw.internet-institute.eu/ ) for example, still host lewin videos.