If you wonder why Apple fights hard in the courts to protect its intellectual property (including its designs), this comment on Slashdot by user Swampash linked to by The Loop holds a lot of the answer.
The Fender Stratocaster was released in 1954 and totally changed the then-new electric guitar market. You can look at well-known electric guitar designs like the Telecaster and the Les Paul and just SEE that they were created before the Stratocaster was released. And you can look at a metric fucktonne of electric guitar designs and just SEE that they were created AFTER the Stratocaster was released. There’s a clear point at which the “before Strat” electric guitar industry became the “after Strat” electric guitar industry. The shape of the Fender Stratocaster – influenced by pre-existing stringed instruments like the cello, but still new and unlike any electric guitar made before – became what electric guitars look like.
Fender did not pursue the Strat-clone manufacturers in court; and then after attempting to trademark the iconic Statocaster contours decades later, a court ruled in 2009 that “the body shapes were generic and that consumers do not solely associate these shapes with Fender Musical Instruments Corporation”. The ruling went so far as to say “in the case of the [Stratocaster] body outline, this configuration is so common that it is depicted as a generic electric guitar in a dictionary.” (bolds mine)
Apple ain’t making that mistake.
From our point of view, it’s important that Apple not be the developer for the world. We can’t take all of our energy and all of our care and finish the painting and have someone else put their name on it. The worst thing in the world that can happen to you if you’re an engineer and you’ve given your life for something is for someone to rip it off and put their name on it.

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