HTTPS Everywhere:
Copyright © 2010-2021 Electronic Frontier Foundation and others
Licensed GPL v2+

HTTPS Everywhere Rulesets (src/chrome/content/rules):
To the extent copyright applies to the rulesets, they can be used according to GPL v2 or later.

The DuckDuckGo Smarter Encryption list, utilized by HTTPS Everywhere at https://www.https-rulesets.org/ddg, is publicly available under the Creative Commons Attribution-NonCommercial-ShareAlike 4.0. International license. 
If you'd like to license the list for commercial use, please reach out to: https://help.duckduckgo.com/duckduckgo-help-pages/company/contact-us/

Issue Format Bot (utils/issue-format-bot/*):
Copyright © 2017 AJ Jordan, AGPLv3+

The build system incorporates code from Python 3.6 and Python 3 respectively
Copyright © 2001-2018 Python Software Foundation; All Rights Reserved