Oracle threw a firebomb of accusations at SAP today, charging its enterprise software rival with corporate theft "on a grand scale."

In a complaint filed in California's Northern District Court in San Francisco, Oracle accused the German software company of engaging in "systematic, illegal access" to its computer support systems.

"Through this scheme, SAP has stolen thousands of proprietary, copyrighted software products and other confidential materials that Oracle developed to service its own support customers," the complaint said.