Oracle likes cats

Oracle is buying Sleepycat, who is famous for it's open-sourced product, Berkeley DB. It is so famous that it is bundled with any modern GNU/Linux distribution. According to the press release, this would "enhance Oracle's market-leading database product family by offering enterprise-class support to customers who need to embed a fast, reliable database at a lower cost"

However, why does Oracle need to buy a company making free software to enhance her embedded database products? Are they buying the brand, the brains, or the product lines?