Nvidia has initiated a lawsuit against both Qualcomm and Samsung for allegedly infringing several patents related to GPU technologies in their SoC's. Both the accused companies have previously refused to enter into licensing agreements with Nvidia.
http://hexus.net/business/news/legal/74317-nvidia-sues-qualcomm-samsung-graphics-patents/
http://hexus.net/business/news/legal/74317-nvidia-sues-qualcomm-samsung-graphics-patents/