There's a digital arms race going on, and you may get caught in the middle of a dangerous battle. On one side, you have Apple creating what's arguably the most secure operating system today, its new iOS 9.
On the other side are hackers, like those at a company called Zerodium, who to want to profit by selling security holes they find in iOS 9. Of course, that company, and its sister company Vupen, have a legitimate side.
They find exploits in operating systems, and then sell those exploits to governments, who can prevent attacks by spying on terrorists, for example. They could also make a profit by selling exploits to companies like Apple, so they can create security patches.
However, some of these companies sell to the highest bidder, even if those are nefarious companies who want to steal competitors' secrets, or governments who want to spy on, and blackmail their own citizens. The ACLU has described some of these hackers as selling "bullets for cyberwar." (We recently told you another shady hacking outfit, The Hacking Team.)