is this fair?

I am going to be using a few pictures from the Heritage Auction Galleries website for an exhibit I will be displaying at Denver. I got the pictures from the perminant auction archives, thus the coins ahve been sold and have a new owner. I am giving Heritage credit for the pics... but is it fair for me to use the pictures without the permission of the current owner of the coin? Thanks
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I've been told I tolerate fools poorly...that may explain things if I have a problem with you. Current ebay items - Nothing at the moment