All photos published on CMYK as Photocrops are licensed under Creative Commons CC0.

We are meant to be used as a "Tool for Creativity" brought to you by CMYK.

Excerpt:

The person who associated a work with this deed has dedicated the work to the public domain by waiving all of his or her rights to the work worldwide under copyright law, including all related and neighboring rights, to the extent allowed by law.
You can copy, modify, distribute and perform the work, even for commercial purposes, all without asking permission. See the rest here.

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You do not have to provide credits to the photographer or to CMYK, but it is always greatly appreciated when you do. (Even in the humans.txt file for you programmers)

You cannot redistribute as your own. To share the photo, you will need to link to the photo page on CMYK.
Do not link to our zip files or downloads, link to the photo page.

More, heavily detailed information is within our Terms of Use and Privacy Policy.