17 CFR § 232.302 - Signatures.
(a) Required signatures to, or within, any electronic submission (including, without limitation, signatories within the certifications required by §§ 240.13a-14, 240.15d-14 and 270.30a-2 of this chapter) must be in typed form rather than manual format. Signatures in an HTML document that are not required may, but are not required to, be presented in an HTML graphic or image file within the electronic filing, in compliance with the formatting requirements of the EDGAR Filer Manual. When used in connection with an electronic filing, the term “signature” means an electronic entry in the form of a magnetic impulse or other form of computer data compilation of any letters or series of letters or characters comprising a name, executed, adopted or authorized as a signature. Signatures are not required in unofficial PDF copies submitted in accordance with § 232.104.
(b) Each signatory to an electronic filing (including, without limitation, each signatory to the certifications required by §§ 240.13a-14, 240.15d-14 and 270.30a-2 of this chapter) shall manually sign a signature page or other document authenticating, acknowledging or otherwise adopting his or her signature that appears in typed form within the electronic filing. Such document shall be executed before or at the time the electronic filing is made and shall be retained by the filer for a period of five years. Upon request, an electronic filer shall furnish to the Commission or its staff a copy of any or all documents retained pursuant to this section.
(c) Where the Commission's rules require a registrant to furnish to a national securities exchange or national securities association paper copies of a document filed with the Commission in electronic format, signatures to such paper copies may be in typed form.