SteamCast Networks, creator of the Morpheus file-swapping software, has filed a lawsuit naming Kazaa, Skype Technologies and its founders Niklas Zennstrom and Janus Friis, among others, as defendants.

The suit, filed in U.S. District Court in the Central District of California, claims that StreamCast owns the technology underlying Internet calling provider Skype. Zennstrom and Friis are also the developers behind file-swapping software Kazaa. StreamCast and Kazaa have argued in the past over software licensing fees.