I'm certainly no expert, but Apple successfully sued eMachines over the eOne that, to my eye, looks "inspired" by the then-current iMac, compared to this HP that looks like an outright copy of the now-current iMac. http://en.wikipedia.org/wiki/EOne
A qwerty keyboard? A rectangular monitor? Having a silvery stand? What?
Surely you don't think that's the extent of the similarity, right? Nearly anyone that sees this machine and is familiar with the iMac is going to say "that looks like a copy of the iMac"; people don't say that about every machine with a QWERTY keyboard and a rectangular monitor on a silvery stand.
I've looked at the two pictured presented and I don't see anything similar besides standard design choices.