InterDigital Signs SII Mobile Communications to Worldwide Patent License Agreement

KING OF PRUSSIA, Pa.-- February 24, 2011 -- InterDigital, Inc. (NASDAQ: IDCC) today announced that its patent holding subsidiaries have previously entered into a worldwide, non-transferable, non-exclusive, royalty-bearing patent license agreement with SII Mobile Communications Inc., a subsidiary of Seiko Holdings Corporation, headquartered in Japan. The agreement covers the sale of SII's wireless products, including 2G and 3G Machine-to-Machine (M2M) modules and PC Cards.

"We are pleased to add SII Mobile Communications to our growing list of licensees," said Lawrence F. Shay, President of InterDigital's patent holding subsidiaries. "With the signing of this new customer, we continue the licensing momentum we have shown over the last eighteen months. Over that time frame, we entered into a dozen new agreements and amendments, adding to our solid base of customers paying recurring royalties and continuing our expansion into new market segments."

About InterDigital®

InterDigital develops fundamental wireless technologies that are at the core of mobile devices, networks, and services worldwide. We solve many of the industry's most critical and complex technical challenges, inventing solutions for more efficient broadband networks and a richer multimedia experience years ahead of market deployment. InterDigital has licenses and partnerships with many of the world's leading wireless companies.

InterDigital is a registered trademark of InterDigital, Inc.

For more information, visit: www.interdigital.com