Your file never leaves this device. We only read it to compute a fingerprint (a SHA-256 hash) right here in your browser. Only that 64-character fingerprint is ever sent on-chain — never the file, never its contents.
Notarize proves a specific file existed, unchanged, at the stamped time. It does NOT prove who authored it, who owns it, or any legal right over the content — only that this exact file existed by then. Change one byte and the fingerprint changes. Each stamp is permanent and cannot be removed. Not legal advice.