Employees are increasingly bringing their own mobile devices into the workplace, creating headaches for corporate IT managers who have to protect a variety of gadgets in order to ensure that data doesn’t leak out. That problem is creating opportunities for a new set of startups, and is helping to drive business for DataCastle.

The Seattle startup just scored $3 million in fresh funding from existing investors, including CM Capital and Haag Investments of Australia. (Founder and Chief Technology Officer Gary Sumner, a former 10-year vet of Microsoft, hails from Australia).

“Business growth is accelerating at Datacastle as we have expanded out channel partnerships and geographies over the past year. The new capital will be used to continue to fuel that growth,” said CEO Ron Faith, the former vice president and general manager of mobile and broadband commerce at Qpass.

Total funding now stands at $16 million.

DataCastle, whose main product helps organizations automatically protect mobile data, just last week secured a multi-year deal with Seagate’s i365 unit in which it will resell the Datacastle RED product for laptop, desktop and tablet data protection. The product will be sold under the EVault brand. The startup also has been working closely with Microsoft on security for Windows Azure, Windows Storage Server and the upcoming Surface Pro.

Other Seattle area companies operating in this arena, include CodeProof, which we featured last month, and Mobilisafe, which was acquired by Rapid7 in October.

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