35 ILCS 200/1-5

When used in reference to an assessment book, all mechanically, electronically, or otherwise produced record making material. The substantive information required to be placed in and kept as a public record in an assessment book by this Code may be transferred from one media to another within this definition, but the substantive information shall not be changed in the process and the record made shall reflect and make available exactly the same substantive assessment information as assessment books would contain and reflect had any other method been used.