The 'Codelmark' is a unique alphanumeric identifier created from a file's contents and stored in Codel's database along with details of the registering party and a time and date of registration To show that the Codelmarks cannot have been changed retrospectively either by unauthorised third parties of even by Codel itself, Codel publishes the Audit in the Financial Times every day Registering data is very simple to do and can either be done, by downloading the software, or integrating the Codel interfaces into software applications Downloaded Software uses a secure hashing algorithm to create a unique fingerprint of the data called a 'Codelmark' Any change whatsoever in the data contained in the file would produce a distinctly different Codelmark and so, for evidential purposes, it is possible to show authorship of data and authenticity of content at a specific point in time