Privacy Policy

Overview

The public book and companion-overview pages can be browsed without an account. Reading chapter companion pages and the newsletter requires a free account, and premium companion material requires a paid entitlement. This policy explains what we collect when you create an account or request premium access.

Account information

When you register we use Firebase Authentication to store your email address and a securely hashed password (we never see or store your password in plain text), and we keep a profile record with your display name, newsletter-email preference, and account timestamps. You can read or change your display name and newsletter preference from your account page.

Newsletter

Reading the newsletter archive is available to any signed-in account. Receiving the newsletter by email is separate and optional: you opt in with a checkbox and can turn it off at any time from your account. We do not sell or share your email.

Payments and premium access

Premium access is granted by direct bank transfer that an administrator verifies manually. If you submit a claim, we store the plan you selected, the amount, the transaction reference you enter, the payment date, an optional note, and the review decision (including the reviewing administrator and reason) as a record of the transaction and your entitlement. We never ask for, and you should never send, bank passwords, OTPs, card numbers, or account screenshots. Payment is processed by your bank, not on this site.

Records we retain

We retain your account profile, payment claims and their decisions, entitlement history, and administrative audit records for as long as your account is active and as needed for accounting, security, and dispute resolution. To request deletion of your account, use the contact details in your book edition or retailer listing.

Browser storage

We use Firebase Authentication’s standard sign-in storage in your browser to keep you signed in. The home page may remember whether to show its introduction again in the current tab, and the article reader can save a bookmark on your device.

Email we send you

We send account email (address verification and password reset) through Firebase Authentication, and service email about your premium claim — a receipt when you file one, and notices when access is approved, declined, or about to expire — through a third-party email delivery provider. These messages are transactional and relate to your account and request; the optional marketing newsletter is separate and controlled by the opt-in on your account page.

Service providers

The site runs on Google Firebase (Hosting, Authentication, Firestore, and Cloud Functions), which processes request logs and the data above to provide the service, and an email delivery provider that sends the messages described above. See those providers’ policies for how they handle that information. Retailer and source links take you to other sites with their own privacy practices.

Your rights

You can access and correct your display name and newsletter preference from your account page, and withdraw newsletter consent there at any time. You may also request access to, correction of, or deletion of your personal data, and withdraw consent for processing, by contacting us (below). We will act on verified requests within a reasonable period, subject to records we must keep for accounting, security, and dispute resolution. If you are in India, these rights reflect the Digital Personal Data Protection Act, 2023; this summary is provided for transparency and is not a legal representation of full compliance.

Contact & grievances

For privacy questions, to exercise the rights above, or to raise a grievance about how your data is handled, use the author or publisher contact details printed in your edition of the book or in its retailer listing. Public corrections are listed on the companion errata page (premium).