RCpp is distributed under the GPL license version 2 or later.
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Copyright (C) 2018 Dirk Eddelbuettel <edd@debian.org>
Copyright (C) 2018 Romain Francois
Copyright (C) 2018 JJ Allaire
Copyright (C) 2018 Kevin Ushey
Copyright (C) 2018 Qiang Kou
Copyright (C) 2018 Nathan Russell
Copyright (C) 2018 Douglas Bates
Copyright (C) 2018 John Chambers

See https://cran.r-project.org/web/packages/Rcpp/index.html
