I see no real problem with it. Aeronautical design is a very well researched area, especially in the transport area. There are very few new ideas, mostly just incorporation of old technology into a new design, or vice versa.
Saying they "stole" anything would be like saying any aircraft with an elliptical wing stole from Supermarine. Or that P&W stole from Heinkel with their axial compressor turbojets.
And those bastards at SAAB stole from the Wright Brothers by using a canard wing.
Nobody owns physics.