Because we need your email to send you your security book you will recieve a "double opt-in" email to make sure you are happy for us to use your email to send you your book.
This may sound odd but thats the rules under GDPR and so we ALWAYS stick to the privacy rules.
(so just click the link in the email we send you and your book will appear - it sounds like magic but it's really just an email!)
Enjoy!