Digital Jedi pretty much nailed this. You have to know the specific type of license under which the content is made available. Most royalty-free content is provided as a way for the creator to gain paid work, meaning there is often some requirement of mentioning the creator or linking the creator's site. Work created after 1978 is copyrighted for the life of the creator plus 70 years. For hire or anonymous works are copyright protected for a period of 95 to 120 years. It would be in your best interest to comply with the licensing on each image or set.
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