/usr/lib/R/site-library/ipred/COPYRIGHTS is in r-cran-ipred 0.9-6-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26  | COPYRIGHT STATUS
----------------
The bulk of this code is
  Copyright (C) 2002-2012 Andrea Peters and Torsten Hothorn
except the code in
  .R/irpart.R
  .R/predict.irpart.R
which are modifications from the files
  rpart.s and predict.rpart.s 
from package `rpart', version 3.1-8 which is
  Copyright (C) 2000 Mayo Foundation for Medical Education and
        Research
with modifications for R by Brian D. Ripley.
All code is subject to the GNU General Public License, Version 2. See
the file COPYING for the exact conditions under which you may
redistribute it.
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