It doesn't matter how many years go by, it still shocks me to the core how one man or group could hate each other so much to inflict that kind of destruction, terror and mayhem towards another.
Such footage should not be owned by a company, unless they're willing to distribute it free of charge - we all should be able to download this for individuals to do what they want. NASA will allow free downloading of their astronaut's landing on the moon.
Most of us know about World War Two because of the free footage available, ranging from the madman mentality of Hitler to the slaying of Jews as part of his final solution.
What has always been available is to see and hear the full horrors, which is free to many.