As a condition to the issuance of a business license as required under Chapter 3.08 of this code, all persons engaged in the business of hanging signs which involves, in whole or part, the erection, alteration, relocation, maintenance or other sign work in or over or immediately adjacent to a public right-of-way or public property so that a portion of the public right-of-way or public property is used or encroached upon by the sign hanger in the sign work, shall agree to hold harmless and indemnify the city, its officers, agents, and employees, from any and all claims of negligence resulting from said erection, alteration, relocation, maintenance or other sign work. (Prior code § 3.13.210)