My husband's grandmother was interviewed as part of an oral history project (Holocaust survivors) in 1990. Her daughter received a copy of the cassette tapes. A digital version can be found online, which was received by the museum that published it online from the original institute that conducted the interview.
The digital version is free to access, however information can only be used without permission for research purposes.
Obviously usage for geneaology is considered research, so I don't see any issues with copyright, however I'm not sure how to cite the information. The copy was given to my mother-in-law, so technically the information is from tapes she owns, however the interview wasn't conducted by her.
I also want to include a link to the digital copy as it's publicly accessible.
There are three parties involved: daughter with cassette copies, university who interviewed, and museum who published.
Do I cite the cassette tapes (from my mother-in-law) with a note of who owns the original? For the link, do I cite the site it's accessible on, and then original interviewers? The information they provide is not very straightforward.
Here's the link of the digital tapes: