There are many ways of accessing data directly, e.g., through simply selecting from a table or view. But when we talk about data security, how many of you know about indirect data access? Well, if you want to know more about it, the DB2 Information Center has a page "Gaining access to data through indirect means".
Some of my favorite tools like db2cat and db2dart are listed, but also diagnostic (dump) files, monitoring data, explain output and of course the catalog views.