The bigger problem is the classic fundamental problem of data retention. The people responsible for retention probably do not value the retention of the data independent of other developments to be of sufficient value to guarantee that retention with robust measures. For example, they could leave unencrypted copies (or encrypted copies with the encryption keys separate) in the custody of the library of congress. Or they could use some sort of N of M keys encryption system and distribute copies and keys to numerous individuals or institutions around the world. Etc. However, while such things would retention of the media would be valuable to the world at large even after, say, a global catastrophe (asteroid impact, nuclear war, etc.) or merely the bankruptcy of the company that created the media such concerns the company itself would tend not to share those ideals.