quote thewatermeloncult
Mention fail.

I never even liked Sega.

Now playing aside...
quote thewatermeloncult
There's a line between innovating something that's already out there and stealing someone else's idea though imo.
"Stealing" is inevitable though. In fact when it comes to technology "stealing" is not a right term unless the implementation of a given technology blatantly use other patents with no permission. Innovation is about taking something that exists and making it better. Nowadays it's not just about creation.
Here's a perfect example. Perfectly fitting for the thread, too.
The idea of gaming systems has been around for years, and it didn't start with Nintendo. The first videogame system that could be bought by average families and that could be connected to a TV was a console released by Magnavox called the Magnavox Odyssey. This gave birth to the videogame industry and to the first generation of gaming systems. Then came the classic Atari, which started the second generation, and it wasn't until the third generation that Nintendo created their own gaming system, which was the NES.
Many seem to think that Nintendo created the first gaming system for house use, maybe due to it's success, completely ignoring the deserved credit for Atari and Magnavox. But everything Nintendo did was to innovate on top of the already existing idea created by Magnavox. Under your own words, this would be a case of Nintendo stealing the original idea by Magnavox. Though Nintendo innovated on top of the Atari, Magnavox where the ones who came with the original idea of gaming systems that could be connected to a normal TV. So if all this was really stealing, Magnavox could go after Atari, Nintendo, Sony, and Microsoft and sue them away.
It may be true that Nintendo created the first motion gaming system for average homes, but Sony and later Microsoft innovated on top of this idea and made it better with the PS Move and Kinect respectively. Sony was the first company to use CDs/DVDs for their console games, and after Nintendo saw a cartridge wasn't enough, they decided to go this same route, but making the DVD's a bit smaller and with more space than those of the PSX.
Innovation is a vicious cycle. Companies are constantly innovating on top of another company's ideas and this is perfect, because they are not stealing ideas per-se; They are just making them better.
Random fact: Nintendo jumped on the gaming system bandwagon later. Originally it was a company who sold playing cards.