When you go against a company that has billions invested in their products; risks losing billions; and has billions of dollars in the bank at their disposal, pissing them off isn't a good idea.
If any part of the design is patented or trademarked or copyrighted, copying those aspects is illegal. If you sell products that infringe on any such rights, you can be subject to exactly what Mr. Knowitall said.
just because somebody is selling or giving away an illegal item, it doesn't mean it is legal. It simple means either the owner of the rights either doesn't care enough to do anything or they simply haven't discovered the infringement.
You can see these Ipod clones being sold everywhere. Ain't nothing illegal about it.
The other thing you need to consider; even if there are no infringements, if Apple believes there is, they have a lot of money to sue. Do you have the finds to defend against even a suit that has no merit?
as I said before; I am not going to chase down IP rights Apple has in their products to try to determine if there are any IP infringements. Apple has the money and power to bring things to a halt should they desire and have the right.
and again, if Apple sues you, you can best believe they have the money to simply force you into non-existence (business wise) if they want even if they do not have a valid suit.
If people import and sell iPod clones, Apple will go after them. If you're selling something that looks similar, but doesn't violate trade dress, purport to be an Apple product, or violate Apple patents, you can sell your similar-looking goods in the U.S.
In case you didn't know, the U.S. is not a country in which Apple doesn't "bother trying" to enforce its IP rights; for that matter, I note that you haven't named a single country that fits that description. The fact that Apple manufactures or sources product in most nations in which knock-off goods might be manufactured puts them in a very good position to secure government help with enforcement of their rights.
Then, even if those companies are untouchable in their country, their products would still be illegal in this country and as such, Apple could pursue actions that would lead to the seizure of that company's products shipped to the US. Apple can also go after the resellers in this country. While it might be a continual process, if you injure the illegal sellers enough, they stop and word gets around that Apple doesn't just roll over and acquiesce to the infringements. That tends to cause other illegal resellers to think twice about selling illegal products.