Which copyrights those pics have?

[django0906]

hi there,

First of all, Thank you all people for making this amazing technology.

I’m a university student who wants making a E-book using your pages' image. When I searched for your image’s licenses or copyrights, but cannot be found(maybe it's my fault). So, I ask about image’s copyrights whether I CAN USE in commercial purposes or NOT.

Images that I want to use linked below.

https://letsencrypt.org/images/howitworks_challenge.png
https://letsencrypt.org/images/howitworks_authorization.png
https://letsencrypt.org/images/howitworks_certificate.png
https://letsencrypt.org/images/howitworks_revocation.png
https://letsencrypt.org/images/Issuance-April-10-2016.png

Could you please reply me when it’s possible? or, Are those pics licensed under the CC-BY-NC 4.0 (Attribution, Non-commercial) according to this topic?

About the Documentation category

T…

Thanks for watching this topic. so sorry for my bad English.

[pfg]

The terms of use link on the website leads to the Linux Foundation's TOS, which states:

Except as otherwise provided, Content on this site, including all materials posted by the The Linux Foundation, is licensed under a Creative Commons Attribution 3.0 License.

There's also a Trademark Policy, which by my reading does not prohibit this kind of usage.

Disclaimer: IANAL and I don't speak for Let's Encrypt in any official capacity.