It's not ok to copy...
But it's not ok either to claim that

1) you own the rectangular design

2) you own the feature of rounded edges

3) you own the icon of using a picture of
* a handset to symbolize "call"
* an envelope to symbolize "mail"
* a clock to symbolize "clock"
* a calendar (rectangle divided into squares) to symbolize "calendar"

These were the features Apple were complaining about.

Look. Every modern device has rounded edges because sharp edges may hurt. Rounded edges are also common in most other designs, not just tech devices.
And do you really want all other companies to use squares, triangles, and other shapes just because Apple thinks using a rectangle with rounded edges is their design "innovation"???

And those icons... if you were designing a phone, wouldn't it be at least *natural* to use a picture of a handset to mean phone, an envelope for mail, and a clock to mean, er, a clock?

Then Samsung wanted to present evidence that there are prior products with rounded edges even by other companies like Sony. But Judge Koh ruled that Samsung cannot present these evidence because it is unrelated; the only issue, he says, is whether Samsung phone's shape is indeed similar to Apple's. That is how stupid US patent law is.

Oh, and btw, Apple also claimed in the trial that using green for call and red for missed call is their "design innovation" which was copied by Samsung. That is bullshit. Those are the most natural colors to use.

If the judges continue to validate these features as Apple's "design innovation", it will force other companies to avoid these good design elements helpful to users rather than compete on better things like features, specs, and size.