PARTS iD 8-K/A Financial Statements and Exhibits

Exhibit 23.1

Consent of Independent Registered Public Accounting Firm

We have issued our report dated February 29, 2008, accompanying the consolidated financial statements of Digimarc Corporation (now known as L-1 Secure Credentialing, Inc.) included in this Current Report on Form 8-K/A. We hereby consent to the incorporation by reference of said report in the registration statements of L-1 Identity Solutions, Inc. on Form S-3 (File No. 333-153701, File No. 333-152783, File No. 333-146696 and File No. 333-145069) and on Form S-8 (File No. 333-151284, File No. 333-150104, File No. 333-149562, File No. 333-143068, File No. 333-28695, File No. 333-42485, File No. 333-36734, File No. 333-65312, File No. 333-65314, File No. 333-65316, File No. 333-120156, File No. 333-137004, File No. 333-137808 and File No. 333-139672).

/s/ Grant Thornton LLP

Portland, Oregon

September 26, 2008