Armadillo itself carries the following in file NOTICE.TXT: Armadillo C++ Linear Algebra Library Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au) Copyright 2008-2016 National ICT Australia (NICTA) This product includes software developed by Conrad Sanderson (http://conradsanderson.id.au) This product includes software developed at National ICT Australia (NICTA) The RcppArmadillo package integrates Armadillo into R, provides wrappers, converters, a test framework, examples and more. It was written by Dirk Eddelbuettel, Romain Francois and Doug Bates with contributions by many others as detailed in the ChangeLog file.