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The original Pyrex code as of 2006-04 is licensed under the following 
license: "Copyright stuff: Pyrex is free of restrictions. You may use, 
redistribute, modify and distribute modified versions." 
 
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Cython, which derives from Pyrex, is licensed under the Apache 2.0 
Software License.  More precisely, all modifications and new code 
made to go from Pyrex to Cython are so licensed. 
 
See LICENSE.txt for more details. 
 
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The output of a Cython compilation is NOT considered a derivative 
work of Cython.  Specifically, though the compilation process may 
embed snippets of varying lengths into the final output, these 
snippets, as embedded in the output, do not encumber the resulting 
output with any license restrictions.