You're welcome to use the examples, problems and applets for your personal studies or research. If you are using this book for a project (homework or research), please cite it somewhere in your project.
You can only use the book's text, examples, problems and applets for non-commercial projects. That means you can remix or make your own version of the book, and you can fork and create new applets, so long as they are not commercial projects (i.e. publishing a book with a publisher).
If you do make a project that forks or remixes this book, it must be released under this same license or a looser one.
If you have any questions about what you can and can't do with these examples or applets, please get in touch.