Video software developer Gotuit Media is suing Microsoft, claiming that its Silverlight multimedia software infringes on three Gotuit patents, which cover ways of making videos searchable on the internet.
Silverlight is Microsoft's alternative to the Flash and QuickTime multimedia formats. It lets Windows users watch video or animated graphics through their browsers.
Gotuit sells software that lets users add text data to video clips, making it possible to search and sort through videos for the parts they want.
In court filings, Gotuit says Silverlight infringes on its patents because it too gives users a way to enhance video with "metadata tags in order to enable video search and navigation and provide a personalised viewing experience."
Microsoft declined to comment.