The board of supervisors may authorize the use of photographs, microphotographs, electronic data processing records, optical disks, or any other medium that is a trusted system and that does not permit additions, deletions, or changes to the original document, or photocopies of all records, books, and minutes of the board.

transcript, exemplification, or certified copy, as the case may be, of the original. Each roll of microfilm shall be deemed and constitute a book and shall be designated and numbered, and provision shall be made for preserving, examining, and using it. A duplicate of each roll of microfilm shall be made and kept in a safe and separate place.

25103, if technically feasible, may be reproduced by the authorized process, and the reproduced signatures shall be deemed to satisfy the requirement of Section 25103. If the documents are signed using an electronic or digital signature, reproduced documents shall be considered authenticated if the reproduced documents are created by a trusted system, as defined in pertinent digital signature regulations, or in compliance with the Uniform Electronic Transactions Act (Title 2.5 (commencing with Section 1633.1) of Part 2 of Division 3 of the Civil Code).