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closed source

noun
    1. intellectual property, esp computer source code, that is not made available to the general public by its creators
    2. (as modifier)closed source software Compare open source
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012