I wonder on what basis these are free. For example, I clicked through to see "Hardware wars", but that video had been taken down due to a copyright claim.
Some, e.g. Soviet films, are published by actual rights holders.
On top of that, afaik everything made in the USSR before 1970 is uncopyrighted in the west because the USSR didn't take part in copyright agreements (at least Wikipedia's guidelines to finding free images told me this). So, you can watch Eisenstein all you want.
Though I'm not sure if restoration and republishing create new copyright or publishing rights.
