Answer: Grantees cannot put a CC BY license on works that are purchased from iStock or other sources, as they are not the creator or rights holder. So, if grantees are mixing these works with new content that are being authored then a statement needs to be included that states: “Except where otherwise noted these materials are licensed Creative Commons Attribution 4.0 (CC BY).”Then, wherever the proprietary, purchased material is used it must be stated that there is a copyright for example, “Photo title x © iStock used with permission.” A grantee can indicate how others can also find and purchase the rights to use it if they want.
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