What is kept: your nickname, your email, and the reason you wrote here. That is the whole record behind your account — no real name, no address, no payment details, nothing else about you.
Your account also carries a simple count of how many books it opens. That is what keeps a leaked code from turning into a hundred strangers, and it is the only reason it exists.
What is never done: no selling, no sharing with third parties, no advertising, no analytics scripts, no tracking across other websites.
Ask for a removal at any time by replying to the email your code arrives in, and the record goes.
The archive is private. Paste the code from your approval email to open the shelves.
No code yet? Ask for access — tell me what you are looking for and why. Lost yours? Get a new one by email.