Online legal resources are increasingly the sole official source. Authentication – the means to demonstrate that materials are what they purport to be – is inseparably interrelated with the official status of sources on the web. This article by Richard J. Matthews examines key features of the UK Statute Law Database, the US Government Printing Office future digital system (FDsys), and the Ohio Supreme Court database of judicial decisions that are relevant to assessing appropriate authentication procedures for those resources. Archival and computational authentication methods are reviewed. Overall findings of AALL's State-by-State Report on Authentication of Online Legal Resources and its recent national summit on authentic legal information on the web are analysed.