CA Civ Code Section 1633.7

(a)

A record or signature may not be denied legal effect or enforceability solely because it is in electronic form.

(b)

A contract may not be denied legal effect or enforceability solely because an electronic record was used in its formation.

(c)

If a law requires a record to be in writing, an electronic record satisfies the law.

(d)

If a law requires a signature, an electronic signature satisfies the law.