I see.
In which case, surely the UI is a function of the Android OS, so why is Samsung the target? Why not all phones with an Andorid OS?
Because Samsung took what was vaguely similar (Stock Android) and made it look far more iPhone styled with their TouchWiz UI changes.
Things like the dots to indicate which homescreen you're on, isn't part of Android, it's just TouchWiz and takes the Samsung software that step closer to looking too much like an iPhone clone rather than a distinct phone.
Remove TouchWiz from the equation and look purely at a stock Gingerbread install for example, and I suspect half of those infringements wouldn't have stood.