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The only route to get a legitimate copy is via Sony, <a href="https://www.companyregistration.playstation.com/SCEInternetApplications/AreaNewLicensee/MainSystem/CFModules/NewLicensee/snl_master_template.cfm" rel="ugc">register as a developer</a> with <a href="http://www.scedev.net/ps4/" rel="ugc">SCE DevNet</a>.<br />
Officially the price is $1500 but if your application is accepted there's a good chance that you'll be lent a Dev Kit for free.
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The only route to get a legitimate copy is via Sony, register as a developer [https://www.companyregistration.playstation.com/SCEInternetApplications/AreaNewLicensee/MainSystem/CFModules/NewLicensee/snl_master_template.cfm] with SCE DevNet [http://www.scedev.net/ps4/].
Officially the price is $1500 but if your application is accepted there's a good chance that you'll be lent a Dev Kit for free.

How to get PS4 SDK 2

A video game console is a device that outputs a video signal or visual image to display a video game. The term "video game console" is used to distinguish a console machine primarily designed for consumers to use for playing video games in contrast to arcade machines or home computers. It includes home video game consoles, handheld game consoles, microconsoles and dedicated consoles.

Game Consoles

Computer games are video games played on a personal computer, mobile device or video game console. Their defining characteristics include a lack of any centralized controlling authority, a greater degree of user control over the video-gaming hardware and software used and a generally greater capacity in input, processing, and output.