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Following licences only apply for samples/box2d, not bundled with J2CL compiler.

--------------------BSD-2-Clause, Zlib------------------------
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--------------------BSD-3-Clause--------------------------------
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---------------------Zlib---------------------------------------------------
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3. This notice may not be removed or altered from any source distribution.


--------------------------------------------------------------------------------

javaemul/internal/Primitives contains code derived from FreeBSD's math library:

// ====================================================
// Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
//
// Developed at SunPro, a Sun Microsystems, Inc. business.
// Permission to use, copy, modify, and distribute this
// software is freely granted, provided that this notice
// is preserved.
// ====================================================