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Privacy notice
Last updated 16 October 2026
The short version: you don't need an account, there are no adverts, and there are no tracking or analytics cookies. The only personal information involved is your internet address, which the web server records briefly to keep the site running safely.
Who runs this site
Cosmic Field Notes at estrelas.co.uk is a free, non commercial learning site run by Cris Morgado, who is responsible for your information under UK data protection law (UK GDPR). You can get in touch at support@fortunastreams.com.
What is collected, and why
- Server logs. Like almost every website, the server records each visit: your IP address, the date and time, the page or file asked for, and your browser type. This is used only to keep the site working and secure, for example to spot attacks or broken links. The lawful basis is legitimate interests.
- How long logs are kept. Logs are deleted automatically after two weeks (15 days at most).
- Nothing else. There are no forms, accounts, comments, newsletters, analytics or advertising trackers on this site.
Things saved on your own device
The site remembers two small settings in your own browser, using browser storage rather than cookies: whether you chose "Simple" or "Show me the maths", and your last few formulas in the Formula Decoder. These never leave your device and are never sent to the server. You can clear them at any time by clearing this site's data in your browser settings.
Cookies
This site does not use cookies at all: no tracking cookies, no analytics cookies and no advertising cookies. That's why there is no cookie banner. The two small settings described above are kept in your browser's own storage, are only read by your browser, and are only there because they are needed for the features you use.
The Formula Decoder
- On this site (estrelas.co.uk/decoder.html), nothing you type is sent anywhere. The worked examples run entirely in your browser, and your recent formulas are only kept on your own device.
- The live version in Claude is optional and runs on claude.ai, not on this site. If you use it, what you type or upload is processed by Anthropic under your own Claude account, and Anthropic's privacy policy applies. This site never sees it. Please don't paste anything personal or confidential into it.
Fonts and videos
The fonts and the films are served from this site itself, so loading a page does not send your details to Google or any other company.
Links to other websites
The site links to research papers, news articles, YouTube videos, Instagram accounts and Claude (for the live Formula Decoder). If you follow a link, you leave this site and that website's own privacy policy applies.
Your rights
You can ask what information is held about you, ask for it to be corrected or deleted, or object to it being used. In practice the only information is short lived server logs, which usually can't be linked to a named person. If you're unhappy with how your information is handled, you can complain to the Information Commissioner's Office at ico.org.uk.
Changes
If this notice changes, the new version will appear on this page with a new date.