/usr/lib/R/site-library/nnls/COPYRIGHTS is in r-cran-nnls 1.4-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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From the public domain source code distributed with the book
Lawson CL, Hanson RJ (1995). Solving Least Squares
Problems. Classics in Applied Mathematics. SIAM, Philadelphia, and
downloaded from http://www.netlib.org/lawson-hanson/
src/nnnpls.f
From the public domain source code distributed with the book
Lawson CL, Hanson RJ (1995). Solving Least Squares
Problems. Classics in Applied Mathematics. SIAM, Philadelphia, and
downloaded from http://www.netlib.org/lawson-hanson/
with trivial modifications to allow for non-positive constraints in
combination with non-negative constraints.
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