The three things he needs to do to comply with the terms of the license are:
This type of license is one that allows the person who requires an image with said license to use it, even modify it so that the resulting image has the deserved attribution to the person who made the original image and that the resulting image has the same license as the original.
For these reasons, it is forbidden for an image resulting from another with the aforementioned license to be placed in an image bank under payment.
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