California Code, Vehicle Code - VEH § 12514

(a) Junior permits issued pursuant to Section 12513 shall not be valid for a period exceeding that established on the original request as the approximate date the minor's operation of a vehicle will no longer be necessary. In any event, no permit shall be valid on or after the 18th birthday of the applicant.

(b) The department may revoke any permit when to do so is necessary for the welfare of the minor or in the interests of safety.

(c) If conditions or location of residence, which required the minor's operation of a vehicle, change prior to expiration of the permit, the department may cancel the permit.

(d) Upon a determination that the permittee has operated a vehicle in violation of restrictions, the department shall revoke the permit.

(e) A junior permit is a form of driver's license that shall include all information required by subdivision (a) of Section 12811 except for an engraved picture or photograph of the permittee, and is subject to all provisions of this code applying to driver's licenses, except as otherwise provided in this section and Section 12513.

(f) An instruction permit valid for a period of not more than six months may be issued after eligibility has been established under Section 12513.

(g) The department shall cancel any permit six months from the date of issuance unless the permittee has complied with one of the conditions prescribed by paragraph (3) of subdivision (a) of Section 12814.6.