Good point. If the information is freely accessible public knowledge I'd guess it would also be easier than if it's something that you had to apply for permission to even see in the 1st place. And how much of published material you can use also depends on how much there is to begin with. Still, I think David Marseilles is right. Far better to make inquires of the company than to assume it's fair use and have someone bring suit against you if it turns out that it isn't available for anyone to use. Fan fics are a good example I think. Some authors don't mind and others do, and there have been some issues sometimes as a result. Best to ask and be told there isn't a problem than to assume and find yourself in trouble.
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