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Again, it gets back to the basic issue: If they are using or selling them images, they would need to have paperwork to back up their rights to the images, and if they claimed to have shot them on their own, then to show the dates, locations, etc.
If you shot them as chromes, you have the originals and there isn't much to argue about.
If you shot them digital, you should still have the original copy on CD or other media, plus any digital data that was in the original shots.
However, all that aside, you said the most important thing: "possible problems arising re transacting biz without licences to operate in that biz - but that is more re financial regulatory stuff, specifically in Canada" - If these people are conducting potentially illegal business, they have very little concern about someone waving a copyright lawsuit at them. Remember too, if they are a Canadian corporation, you can go after the corporation but you will have a very hard time going after the individuals that own the corporation.
Good luck.
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