Texas Civil Practice and Remedies Code - CIV PRAC & REM § 80.002. Trespass

(1) erects or places a sign on premises without the permission of the owner of the premises;  or

(2) after the expiration or termination of an agreement with the owner of the premises for the erection, placement, or maintenance of a sign on the premises and before the expiration of the period described by Section 80.003(b)(2), fails to remove or abandons a sign or fails to obtain from the owner of the premises permission for the continued use or maintenance of the sign on the premises.