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- Downstream recipients.
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When you include someone else's CC-licensed work in an adaptation, you may license the adaptation under other terms, but the underlying CC-licensed work remains under its CC license. From the CC FAQ:
If I derive or adapt material offered under a Creative Commons license, which CC license(s) can I use?
If you make adaptations of material under a CC license (i.e. "remix"), the original CC license always applies to the material you are adapting even once adapted. The license you may choose for your own contribution (called your "adapter's license") depends on which license applies to the original material. Recipients of the adaptation must comply with both the CC license on the original and your adapter’s license.
When sharing someone else's work, the original CC-licensed work always remains under its original license. By contrast, the "ShareAlike" condition means that your own work used in an adaptation of a CC-BY-SA work must be placed under CC-BY-SA terms as well. ShakeAlike does not refer to the requirement to preserve the license on existing CC-licensed material (which is always present), but rather it refers to the requirement to include it on new material.