"However, we want to be clear that this edition is only free to read online, and this posting does not transfer any right to download all or any portion of The Feynman Lectures on Physics for any purpose."
"Download", as used in practice on the internet when referring to documents generally means copying the whole thing to your computer such that it can be used there without further internet access.
It generally does not include temporary transfer of small parts of the document for immediate reading, except when the focus of the discussion is about the underlying mechanics of the transfer.
This supposed duality is nonsense. A change of cache settings in your browser amounts to the same result. There's no such thing as a "temporary transfer", and I think we should not entertain the notion.
I don't see how it's any different from time-shifting with VHS. In this case, you're just using a longer-term "temporary" format (epub, mobi, pdf) which allows you to peruse the website later.
This repository previously included a toolchain to build a collection of eBooks, in ePub and MOBI formats, from Caltech's online edition of the Feynman Lectures. Those scripts have since been removed, in response to the suggestion that their continued availability might lead to a permanent discontinuation of HTML access.
If anybody was wondering and looking at the forks, these scripts don't work anymore. They have converted the links to simple Javascript functions to link to chapters which stop these scripts from running now.
That's a terrible quality pdf. For $14.99 you can purchase the enhanced version here: http://www.basicfeynman.com/enhanced.html
It was very cool of the publishers to allow this, and they deserve our support.
Otherwise, if you must download the basic version, go to the piratebay and search for "Feynman Lectures on Physics (epub,mobi,html) - FIXED"
"However, we want to be clear that this edition is only free to read online, and this posting does not transfer any right to download all or any portion of The Feynman Lectures on Physics for any purpose."