Let's take another moment to consider that Apple is far clear of their own blatant ripoffs (sorry....'reverse engineering') going as far back as the mouse and windows GUI as created by IBM PARC, or, say, more recently, arguably the original Touch / iPhone vs the Palm TX.
You also need to consider the Newton predated the Palm, and IBM's Simon was the first touchscreen phone.
As for ZEROX PARC and the mouse, it was first developed at SRI with ARPA funding, and later work done at XEROX PARC. The work that lead to windows was also started at SRI.
My point: There is a difference between building on and improving an idea and just copying it outright in your own product.