Off by default. On: a private seller's shown name and phone numbers (privateSellerName, privateSellerPhones), an agent's own name on agency ads (contactName), the phone numbers and e-mail addresses found in the description (descriptionPhones, descriptionEmails) and an agency's legal representatives (legalRepresentative) are delivered as Immowelt shows them logged out. Off: those fields are empty, and so are their copies in rawData (the card's contact title when it names a person, a private seller's phone numbers, the record's contact block). With the switch on or off, titles, headlines, descriptions and the record's price lines are delivered as readable plain text (typographic dashes, the minus sign, the curly apostrophe and single quotes (’ ‘) and special spaces turned into plain ASCII, soft hyphens and zero width spaces and joiners removed, HTML tags and the usual HTML entities turned into text, runs of ordinary spaces and tabs collapsed to one), up to generous lengths; every other short text (the price as shown, features, an ad row's agency address, reviews) gets the same character changes without the HTML reading; an agency page's address, legal address and opening hours come as Immowelt writes them; nothing is masked; rawData keeps Immowelt's objects as served. The README's Personal data section has the details. You are responsible for using personal data lawfully (GDPR included).