Datacard Group has acquired Entrust Inc. from private equity firm Thoma Bravo LLC.

Dallas-based Entrust develops software that aims to provide security to governments, companies and financial institutions. The software manages identity credentials, cloud and mobile security and physical access. Terms of the deal were not disclosed.

Datacard, headquartered in Minnetonka, Minn., provides products and software that allow governments and companies to securely issue credit cards, passports, national IDs, employee badges and mobile payment applications.

San Francisco-based Thoma Bravo bought Entrust in July 2009 in a take-private transaction. During Thoma Bravo’s ownership, Entrust’s revenues increased from $91 million to $120 million. The company’s Ebitda also increased to 34 percent of revenue, up from 7 percent in 2008, when the company was public.

For Thoma Bravo, which now invests heavily in the software-security sector, Entrust was the firm’s first software security buy. The firm is currently invested in software-security companies Blue Coat Systems Inc. and Landesk Software Inc.

In December, Thoma Bravo sold Network Instruments LLC to JDS Uniphase Corp.(Nasdaq: JDSU) for $200 million. In August, the firm closed a $395 million deal for cloud-based testing services company Keynote Systems Inc.