Cal. Corporations Code § 17 : California Corporations Code — General Provisions — "Signature" defined Date: 14 Sep 2016 TEXT PDF Current through the 2016 Legislative Session "Signature" includes mark when the signer cannot write, such signer's name being written near the mark by a witness who writes his own name near the signer's name; but a signature by mark can be acknowledged or can serve as a signature to a sworn statement only when two witnesses so sign their own names thereto. Ca. Corp. Code § 17