Blackboard Starts New Legal Battles in Course-Software War

Blackboard Inc. opened a new front in its battle against rival Desire2Learn at the end of April, filing a complaint with the U.S. International Trade Commission that seeks to block the import of the Canadian company's software products because of alleged patent infringement.

In Blackboard's filing with the commission, the company called for an investigation and asked that the body ultimately "halt the importation, marketing, advertising, demonstration, servicing, sale, and use" of

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