diff --git a/books/free-programming-books-langs.md b/books/free-programming-books-langs.md
index 5b12434e7..75baee2c0 100644
--- a/books/free-programming-books-langs.md
+++ b/books/free-programming-books-langs.md
@@ -1142,7 +1142,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [Designing Scalable JavaScript Applications](https://www.manning.com/books/designing-scalable-javascript-applications) - Emmit Scott (PDF+livebook)
 * [Dev Docs](https://devdocs.io/javascript/) - Various (HTML)
 * [DOM Enlightenment](https://frontendmasters.com/guides/javascript-enlightenment/) - Cody Linley
-* [Eloquent JavaScript 3rd edition](http://eloquentjavascript.net) - Marijn Haverbeke (HTML, PDF, EPUB, MOBI)
+* [Eloquent JavaScript 3rd edition](http://eloquentjavascript.net) - Marijn Haverbeke (HTML, PDF, EPUB, MOBI) (CC BY-NC)
 * [Essential Javascript](https://www.programming-books.io/essential/javascript/) - Krzysztof Kowalczyk, StackOverflow Contributors
 * [Exploring ES6](http://exploringjs.com/es6/) - Axel Rauschmayer (HTML)
 * [Functional-Light JavaScript](https://github.com/getify/Functional-Light-JS) - Kyle Simpson (HTML)
@@ -1992,7 +1992,7 @@ Books on general-purpose programming that don't focus on a specific language are
     * [Introduction to Programming Using Python](http://python-ebook.blogspot.co.uk) - Cody Jackson (1st edition) (2.3)
 * [Introduction to Python](http://kracekumar.com/post/71171551647/introduction-to-python) - Kracekumar (2.7.3)
 * [Introduction to Python for Econometrics, Statistics and Numerical Analysis](https://www.kevinsheppard.com/files/teaching/python/notes/python_introduction_2020.pdf) - Kevin Sheppard (PDF) (3.8)
-* [Introduction to Scientific Programming with Python](https://library.oapen.org/bitstream/id/56d27e73-e92a-4398-8198-239be7aacc93/2020_Book_IntroductionToScientificProgra.pdf) - Joakim Sundnes (PDF)
+* [Introduction to Scientific Programming with Python](https://library.oapen.org/bitstream/id/56d27e73-e92a-4398-8198-239be7aacc93/2020_Book_IntroductionToScientificProgra.pdf) - Joakim Sundnes (PDF) (CC BY)
 * [Invent Your Own Computer Games With Python](https://inventwithpython.com/invent4thed/) - Al Sweigart (3.4)
 * [Learn Python 3](https://github.com/animator/learn-python) - Ankit Mahato (PDF, HTML, Markdown)
 * [Learn Python, Break Python](http://learnpythonbreakpython.com)
@@ -2072,7 +2072,7 @@ Books on general-purpose programming that don't focus on a specific language are
 * [The Standard Python Library](https://web.archive.org/web/20200626001242/http://effbot.org/librarybook/) - Fredrik Lundh *(:card_file_box: archived)*
 * [Think Complexity](https://greenteapress.com/wp/think-complexity-2e/) - Allen B. Downey (2nd Edition) (PDF, HTML)
 * [Think DSP - Digital Signal Processing in Python](https://greenteapress.com/wp/think-dsp/) - Allen B. Downey (PDF, HTML)
-* [Think Python 2nd Edition](https://greenteapress.com/wp/think-python-2e/) - Allen B. Downey (3.x) (HTML, PDF)
+* [Think Python 2nd Edition](https://greenteapress.com/wp/think-python-2e/) - Allen B. Downey (3.x) (HTML, PDF) (CC BY-NC)
     * [Think Python First Edition](https://greenteapress.com/wp/think-python/) - Allen B. Downey (2.x) (HTML, PDF)
 * [Tiny Python 3.6 Notebook](https://github.com/mattharrison/Tiny-Python-3.6-Notebook) - Matt Harrison (3.6)
 * [Tiny Python Projects](http://tinypythonprojects.com/Tiny_Python_Projects.pdf) - Ken Youens-Clark(PDF)