Another alternative to both paper and electronic registration is the use of paper-equivalent electronic stock certificates. Forty-seven states have enacted legislation equivalent to the Uniform Electronic Transactions Act, which formalizes equivalency for electronic signatures "in writing" requirements. This, together with the enactment of legislation permitting the use of "facsimile" signatures on certificates (such as in §158 of the Delaware General Corporation Law), has given rise to software as a service technology for private companies to create, issue and manage paper-equivalent electronic stock certificates.