Blume is a corporation specialized in communications and security technology.
The Blume Corporation specializes in everything from mobile telephony, to home computing, digital imaging processors and networked security systems. Blume developed ctOS.
The Central Operating System (ctOS) controls the electrical infrastructure in Chicago. The ctOS also stores information about Chicago's citizens.
Assassin's Creed IV: Black Flag Edit
Blume advertises the ctOS to Abstergo Entertainment, and offers the possibility of having a localized system installed at their Montreal facility.