Tracing copyright owners and asking permission.
Thanks for the update Broadbentius. It's a fascinating topic so I hope we do get some clarification in time.
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I am aware of Ronald Borst’s connection, but don’t believe him to be a copyright holder, though I can’t confirm that for a fact, although he may indeed own some original art. I have made some small progress in this search though, but things are right now at a very sensitive stage in my dealings with an organisation and I wouldn’t like to risk jeopardising anything by posting here.