If Tax Lien Vault is providing your information to third parties without your permission, that should tell you the type of company they are. 

It doesn't happen very often, but it does happen.If the owner wasn't involved... we would have already re-keyed the locks and charged it back to the tenants for changing the locks without permission (against our lease agreement) and not providing us a key.Be advised... occasionally tenants can be like children of divorced parents trying to pit one against the other.

There should be a clause in your lease saying that only the people signing the lease and children identified by name are authorized to live there and any body else "must have the express written permission from the owner".Obvious exceptions would be birth of new child or adoption/foster care.

If silent on the matter, state law will say what is permissible, and what is not.

My normal lease says dogs must have landlord permission.

You do not need their permission to enter your property, you simply need to give proper notice.

There is an ethical code for attorney's that prohibits direct contact with represented parties without the permission of their attorney.

The buyer has the seller’s permission to begin marketing the property immediately and by whatever means deemed necessary by the buyer.

Don't forget the important clause (if you don't already have it included) mentioned by Jon giving you permission to market the property and that includes showings.

Never the less I call the male tenant and he said that he changed my locks without permission and thinks the 80 year old and her friend were trying to get in!