In this page you can find some images that are completely free to use according to the Creative Commons Attribution-NoDerivatives 4.0 International (CC BY-ND 4.0).

Long story short: you can use, share, copy, redistribute these images in any medium or format and for any purpose, even commercially.
BUT you cannot modify them in no way.

Just to be even clearer: if you cut the credits off, if you add your name or logo, if you change something in the images: you are acting against the license, so please do not do that.

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Enjoy these free contents!