If you buy a BMW roundel off the street that wasn't manufactured or authorised to be manufactured by BMW then the manufacturer is in breach of copyright of BMW because it is a manufacturers mark and is associated.
If BMW have created a drawing of a part to be manufactured then this drawing is copyright protected, if another manufacturer makes an identical part, without agreement to this drawing they are in breach of copyright. However making a small change can lead to the item being unique and thus not in breach (BBS may have the right for the CSL design, another company can make something subtly different and not be in breach)
If BMW create a sketch/drawing of a vehicle, this is protected by copyright, so if another manufacturer copies the design then they are in breach, just recall the Samsung vs Apple debate.
For software and recordings it is slightly different, currently if you copy any recorded media i.e. convert a CD to MP3 you are technically in breach of UK copyright law. Anyone can write new software for existing hardware as long as it is different from the original, so I could write a new operating system for the iPad and as long as it is sufficiently dissimilar to the original I'm okay, however you can guarantee that Apple would litigate against me.