The Lars Pipe Organ samplesets were created by Lars Palo and licensed under a Creative Commons Attribution-ShareAlike (BY-SA) 2.5 license. Every note of each stop was sampled for full duration in stereo providing a beautiful accurate tone. Four pipe organs are provided with the Burea Funeral and Church organs combined into a single .KSC. The Programs load into USER-GG by default. Each multisample represents a different pipe organ stop. Some of the stop (multisample) names begin with HV, POS, SV, etc which represent the manuals on the original organs. The number at the end, if provided, is the footage of the pipe.

More info regarding the organs can be found here.
Information regarding the Creative Commons licensing can be found here and the full license agreement here.

Regarding use in the Korg Nautilus: Because these libraries require so much RAM and because the Nautilus has significantly less RAM available than the Kronos in its normal configuration, they are not recommended.  The Nautilus comes with upgraded, stereo church organ samples likely rendering these libraries unnecessary.  However, they will load into the Nautilus given sufficient RAM.