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Licensing
See here for the website owner's comments on copyright. The file is among Baha'i media covered by copyright notices here and here:
Audio-Visual content including video clips, audio clips, maps and photographs may be cropped and edited for size. No other editing is permitted. Each user of the Audio-Visual content is given a limited, non-exclusive licence to use, reproduce, distribute, link and/or display this content provided the intent, character, nature or meaning of the content remains unaltered.
Regarding this specific file, the website owner Jonah Winters says: "I got permission from the person who made the centenary website, and he confirmed that the material was covered by the general Terms of everything else in the Baha’i Reference Library"