News provider TechCrunch said search engine provider Google was not the strategic investor.

Alongside Intel Capital in the round were online data storage company VMware and venture capital firms.

Wilson Sonsini Goodrich & Rosati backs Indix.

The company was part of Flashpoint, a Georgia Tech university accelerator.

KPCB invested nearly $6m, TechOperators put in $1.8m and Google Ventures $250,000 in Ionic Security, according to BizJournal.

Daryle Doden, chief executive of Ambassador Enterprises, said: "Bookshout is eliminating the guesswork and building tools that let content creators take control of their audience."

In July 2011, Citrix invested $2m in Gizmox as part of a $3.5m convertible loan, according to news provider Globes Online.