sentences:  This is similar to the later PlayStation 4 console which also has two APIs, the low level GNM and the higher level GNMX.Unlike the Software Development Kit (SDK) for mobile apps, Sony's PlayStation 3 SDK is only available to registered game development companies and contains software tools and an integrated hardware component.Due to the fact that it requires a licensing agreement with Sony (which is considered expensive), a number of open source and homebrew PS3 SDKs are available in addition to a number of leaked PS3 SDKs.