Most legal databases provide full-text access to sources of law - treaties, legislation and court judgments (either as law reports or transcripts - sometimes both) - as well as commentary in the form of books and articles published in law journals. Some databases also include an indexing/abstracting service picking up articles in journals not included in their own holdings.
Most legal databases require an Oxford SSO even when on the OU network. (This is a term in their licences.)
For help discovering legal databases for specific topics, countries or legal systems: