I have performed some field work (specifically an as built survey on the sanitary sewer and storm drain systems of a new subdivision) which the general contractor in charge of building the subdivision has not paid for. The data from this field work has been forwarded to a local engineering firm in order that they can satisfy city/county requirements for as built data. My question: What is the general opinion concerning contacting the local engineering firm and issuing a statement regarding the use of this intellectual property without payment? Should the engineering firm honor such data as still being the property of the surveyor until such time as payment is made by the contractor before utilizing said data? Would contacting the engineering firm be ethical?