Quote Quoting DENIMKATY
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Surely if someone told a crook where a home owner keeps a spare key, that would be illegal.
If you tell me where you keep your spare house key, I am legally free to tell anyone I choose to, unless I have entered into a legally-binding, enforceable and (usually) written confidentiality agreement with you that spells out to whom I can or cannot divulge this information. No agreement as described = no illegalities.