Yep totally no strings attached, there is some "paid for" material available from the same website, but for the book itself, and the helpful emails, you just need to register your email address.
Good to see you here Slideyfoot, gives me a chance to thank you directly. I have trained in a few different combat sports, and had trial sessions in many others, and I think BJJ is the hardest for a beginner because it is so complex. It is easy to get quickly disheartened. Resources like the one you put together are invaluable, so thank you.