Spooky might want to consider putting their images in an escrow storage provider's vault. software startups do this all the time. It prevents a software company going out of business from impacting its customers afterwards. I don't think this is going to bite anyone, but it's a precaution if potential buyers ask about it. I doubt SPOOKY has any longevity issues, but the escrow approach gives previous licensees peace of mind by guaranteeing access to the software anytime its needed in the future if the original author is unavailable.