Privacy Policy

Effective 22 October 2026

The short version: this website collects nothing about you. It sets no cookies, runs no analytics, and builds no profiles. There is nothing to opt out of.

Who is responsible

This site, retuningthereceiver.com, is published by Frederick Manfredi (Semi-Dirac Press). For any privacy question, contact privacy@retuningthereceiver.com.

What the site collects

Nothing. Browsing and downloading the book require no account, no form, and no personal details. The site sets no cookies of its own, uses no analytics or tracking (no Google Analytics, no pixels, no advertising tags), and does not fingerprint visitors.

Server logs

Like virtually every website, the hosting provider that serves these pages may keep standard technical request logs — such as IP address, timestamp, and the file requested — for a limited time to keep the site secure and reliable. This is ordinary server operation (legal basis: legitimate interest). These logs are not used to identify, profile, contact, or track you, and are not combined with anything else.

Resources loaded from other providers

To display correctly, pages load a few files from third-party networks. When your browser fetches these, your IP address is necessarily transmitted to the provider so it can deliver the file. These providers set no cookies on this site and do not track you here:

• Google Fonts — the typefaces used across the site.
• jsDelivr (CDN) — the MathJax library that renders equations on some pages.
• THREE.js — the library that loads graphics in the visualization pages, whether on the site or local.

This is the only way any personal data (your IP) leaves your browser from a normal page view, and it happens solely to load the page's appearance.

Donations (BTCPay Server)

Donations are entirely optional and anonymous. The donation form on this site posts to, and loads its pay button from, a separate domain, which runs a BTCPay Server. There is no iframe or embedded checkout — the page simply contacts that domain directly.

• No name, email, address, or account is requested or required to donate.
• Payments are Bitcoin / Lightning ("sats"). The recipient sees a payment and not your identity.
• Because the pay button is served from the BTCPay domain, that domain may set its own strictly necessary cookies (a session and an anti-forgery/security token) when a page carrying the donation form loads, not only when you click. These cookies exist solely to make the payment function work; they perform no analytics, advertising, or cross-site tracking. Under the ePrivacy rules, cookies used only to carry out a payment are treated as essential and do not require a consent banner.

These cookies belong to the BTCPay domain, not to retuningthereceiver.com, which sets no cookies of its own.

External Links (Amazon, Zenodo, github)

Links to external websites are independent companies with their own privacy practices. Once you are on those sites, their privacy policies — not this one — governs your data.

Your rights

Under the GDPR (and similar laws) you have rights to access, correct, or erase personal data held about you, and to object to processing. Because this site holds no personal data about you and sets no cookies, in practice there is nothing stored here to request or delete. If you have any concern, write to the contact above and it will be addressed.

Children

This site is not directed at children and knowingly collects no data from anyone, regardless of age.

Changes

If this policy ever changes, the updated version will be posted here with a new effective date.