InterTrust lawsuit seeks to block release of Windows XP

InterTrust Technologies Corp. announced Thursday that it has expanded its patent infringement lawsuit against Microsoft Corp., and has asked the court to issue an injunction preventing the release of Windows XP.

InterTrust filed an amended complaint against Microsoft in the U.S. District Court for the Northern District of California, which alleges that the Redmond, Washington-based software company infringed on a U.S. patent issued to InterTrust on Wednesday. InterTrust has also requested an injunction to halt the sale of Microsoft products, including Windows ME and Windows XP, which is scheduled to go on sale later this year.

In the original complaint, filed on April 26, InterTrust alleged that Microsoft's Windows Media Player and other products implement a variety of rights management functions that infringe on a patent issued to InterTrust in February this year. Digital rights management technology helps to manage and protect proprietary data such as digital music files.

The amended complaint adds allegations that Microsoft infringes on an InterTrust patent issued on Wednesday. That patent, which InterTrust originally filed for consideration in 1995, includes claims relating to the secure transfer of digital files as permitted by rights management rules, InterTrust said in a statement.

Microsoft officials could not immediately be reached for comment.

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