NSPE members now have free access to a new report that provides a state-by-state summary of the sometimes confusing rules on the digital signing and sealing of engineering documents. The ethical responsibility to meet the required standards for signing and sealing engineering documents is among the most fundamental responsibilities of a professional engineer. In most of the states that allow electronic signatures, the signature must be: 1) unique to the person using it, 2) capable of verification, 3) under the sole control of the person using it, and 4) linked to the document.