Research Triangle Software is expanding its business beyond cryptology and memory sticks.

The Cary-based firm founded and led by Jeff LeRose announced late Wednesday that it had acquired FullSeven Technologies. The venture-backed startup is focused on email communications.

Terms of the deal were not disclosed.

The deal creates some interesting possibilities for enhancement of email with encryption technologies. RTS’ CryptoSticks have been purchased by a number of high-profile customers, including Special Forces Command of the U.S. military.

In a statement, RTS said that FullSeven’s employees would move into RTS’ offices. RTS also said that all employees would keep their jobs.

“The acquisition of FullSeven positions RTS for growth by expanding our product offering and providing us with immediate cross-selling opportunities,” said LeRose, chief executive officer of RTS. “FullSeven has a solid application in LetterMark email and has done an excellent job of building and maintaining a diverse customer base. We are excited to have them join the RTS family and are looking forward to realizing the synergies that exist by integrating encryption technology with Web-enhanced email.”

“With help from our board of directors and venture partners, we were able to construct a remarkable opportunity for our customers, investors and employees,” said Ken Arneson, chief executive officer of FullSeven. “The feedback we’ve received from our customers is very positive and underscores the significant potential of this combination. We look forward to accelerating our development and sales efforts to bring web-enhanced email and encryption technologies to the next level.”

LetterMark puts a graphical face on email and includes additional features designed to create brand awareness. It also incorporates web links to related sites as determined by customers. The company has won a number of customers over the past three years.

FullSeven received a Series A investment from Southern Capitol Ventures in July of 2002. At that time, Barrett Joyner, the chief executive officer who had formerly worked for SAS, was promoted to chairman. He later left to join MiCo, another RTP firm.

“The acquisition of FullSeven by RTS is a strategic move for both companies,” said Ben Brooks of Southern Capitol Ventures. “FullSeven receives the infrastructure and development resources needed to maintain LetterMark email’s leadership position in a competitive industry. RTS inherits a large customer base and a product that, when combined with its encryption technology, becomes the most complete offering in a growing marketplace.

RTS also has an education division.

LeRose, who also founded Research Triangle Commerce, launched RTS in 2002.