PenOp Inc. said its signature verification software is being added to the capital markets software of Intralinks Inc.

Intralinks customers may use the system for the electronic signing of syndicated loan or other documents. Since April 1997, Intralinks has facilitated more than 200 Internet-based transactions-such as syndicated loans, private placements, and mergers and acquisitions-with total value exceeding $150 billion.

PenOp's Signature Series software lets people enter legally binding signatures on electronic documents. The signature data are encrypted and biometrically verifiable.

PenOp customers use a stylus to sign documents directly on a computer screen or on an external attachment known as a digitizer. Because the signature is handwritten, it is legal, said the company's chief executive officer, Howard Schechter.

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