I was invited to give a talk (which seemed to turn into a plenary then a keynote along the way) for the GLAM-Wiki 2013 conference. I thought it might be useful to put current discussions around opening cultural data for use on Wikipedia and other projects that require content to be licensed for re-use in context (for the museum, library and archive professionals in the audience) and some of the contradictory instructions issued to institutions with cultural, scientific or historical content (for the Wikipedians in the audience, though of course there was a huge overlap between those groups).
I've blogged my talk notes as 'An (even briefer) history of open cultural data' at GLAM-Wiki 2013 at Open Objects or there's a video of my talk.