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diff --git a/doc/COPYRIGHT.PATENT b/doc/COPYRIGHT.PATENT
index dd1d91e6..5e4db7d7 100644
--- a/doc/COPYRIGHT.PATENT
+++ b/doc/COPYRIGHT.PATENT
@@ -25,6 +25,13 @@ at appropriate places within the package.  A slightly out of date
 summary of all the copyrights is in the file 'doc/copyright_summary'
 in the Netpbm source tree.
 
+Each component is a package of code and documentation; e.g. the 'pamcomp'
+program and the pamcomp user manual go together and are licensed to the public
+as a package.  The Netpbm manual is just a hyperlinked collection of such
+component manuals.  Parts of the manual that are not tied to a particular
+component of code and do not carry a copyright notice are in the public
+domain.
+
 As with most public open source software, no one really knows for sure
 where the code came from.  It is possible that a contributor copied it
 without license to do so.  That might mean any user of the code owes