Arcsight sells security information and event management (SIEM) software, a subset of enterprise security devoted to logging and analyzing behavior on a corporate network to find and prevent cyber-threats.

FORBES: HP Acquires Arcsight In Ongoing Security Shopping Spree

Security Event Information Management (SEIM) and Managed Security Service Providers (MSSP).

FORBES: DHS Deploying Wrong Weapons In Cyberwar

The heightened security comes despite the lack of specific and credible threat information relating to the event.

CNN: Security at record high for WWII Memorial ceremony