В соглашении с автором прописано, и при покупке тоже есть для покупателя инфа.
У них всё скользко, я подозреваю, что они крутят и так и так, как выгодней им.
Вот несколько абзацев для примера.
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Royalty-free (RF) licenses
Most of our photos, illustrations, video and music clips are available under our standard royalty-free license, which lets you use them in a wide variety of projects, including advertising, websites, blogs, presentations, video productions, podcasts and more. Because these files are royalty-free, you only pay for the initial download of the file and don't have to pay a royalty each time you use it. Your license lets you use the content as many times as you want, wherever you want for as long as you want (within the terms of the content license agreement.)
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Rights-managed (RM) and Rights-ready (RR) licenses
Photos and audio clips available under rights-managed licenses and video clips available under rights-ready licenses are different from royalty-free licenses in that your license is based on how, where, and for how long you intend to use the content, with the possibility of obtaining exclusive rights. Since the license you're paying for only covers a specific use, you can't use the image, music clip or video clip in additional projects without purchasing additional licenses.
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Exclusive rights-managed photos
The biggest benefit of rights-managed content is that you can make sure no one else can use a photo you've licensed for a campaign. We offer copyright buyouts, exclusive licenses and license embargos. You can also choose from a range of flexible rights-managed exclusivity options, including by industry, usage, or both. It's a great way to keep your campaign unique and protect your investment.