The videos are in 1440x896 and play well in VLC, and are distributed freely under the Creative Commons Attribution license.
So why to buy it ?
Because if you don't, open project like this one will stop. The Blender Open Movie Workshop DVD series is a Blender Institute product and compare to other company who sells tutorial ; this buisness model rocks. Think about it ; By purchasing this DVD you support the Blender Foundation projects and the free culture.