Tablus, a San Mateo start-up that provides content protection software, said it has raised $16 million in a second round funding from Trident Capital and Menlo Ventures. It is one of many players in the area, which includes companies like PortAuthority, Vontu and Reconnex.

Anne Bonaparte, president and CEO of Tablus was the former chief executive at MailFrontier, an email security company, also backed by Menlo Ventures. MailFrontier was acquired by SonicWall, so Bonaparte is out to do it again.

According to the company’s statement:

Customer awareness of information risk has been fueled by high profile data leaks and an increase in state and federal privacy regulations. Tablus’ comprehensive content protection solutions reliably and accurately monitor sensitive data so that enterprises can be assured of where information resides on the network, who has access to the information, and how the information is being used. The company’s $16 million Series “B” round of funding, which included venture capital firms Trident Capital and Menlo Ventures, brings the total financing received by Tablus to date to $24 million.