No surveillance, no accounts
Privacy, plainly
The public-preview site has been designed not to require a login or collect personal details simply to read a sample or play a puzzle.
What the website itself does
The static preview has no account system, embedded analytics, site cookies, payment checkout or server-side submission form. The Sudoku runs in your browser. The sampler is a PDF download.
Email contact
Contacting the author opens your own email application; email providers will process that correspondence according to their terms. Do not send names, inmate numbers, legal documents or sensitive personal histories just to ask a general question.
Hosting
Hosting and network providers may maintain security and access logs. This site does not promise anonymous browsing or absolute confidentiality.