This document discusses two major data security breaches - the 2014 Sony Pictures hack and the 2014 Staples data breach. The Sony hack involved a malware attack that stole 100TB of data including unreleased films and employee emails. It cost Sony an estimated $1.25 billion. The Staples breach saw 1.16 million customer payment cards compromised over 6 months. Both could have been prevented with better security practices like network isolation, encryption, and prompt patching of vulnerabilities. The document emphasizes the importance of data security for companies.