Residents of California have special rights under the California Consumer Privacy Act (the "CCPA"). Here is a site that offers good information about the CCPA: https://www.caprivacy.org.
Leanpub does not sell your data, which is why you will not see a "do not sell my data" link on pages where we collect your information. We use a variety of third-party services for normal business purposes; you can find a list of those services in our Privacy Policy.
If you would like to exercise your rights under the CCPA, please email us at privacy@leanpub.com or contact us by post at the address you will find in our Privacy Policy. Please note you are required to provide us with adequate information to identify yourself as the person about whom we may have collected personal data, and with sufficient information to understand and process your request.