
The source code for R-view doesn't include a license file, and the only note in the
source code is in lib/R-view/src/rview_config.h which says it is GPLv3.
This gets printed as a banner when running the R-view program. The banner is:

# R-view :: R-view - basepairs(RNA) and contacts(RNA/peptides) from a pdb file
# R-view 0.1 (August 2018)
# Copyright (C) 2018 Howard Hughes Medical Institute.
# Freely distributed under the GNU General Public License (GPLv3).
# - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -

