Add comment on sendmail

dosp-survey.ltx

@@ -134,7 +134,9 @@ for licenses.
 % Sorry for the super-long sentence. I'm sure we'll break that up somehow.
 
 % Rosen also says that sendmail may have had a dual license in the same
-% era or even before Ghostscript.
+% era or even before Ghostscript.  I found references to sendmail having
+% a "traditional" dual license but so far have not found references to a
+% scheduled relicensing practice.
 
 \subsection{Bounty and Sponsorship Delays}\label{bounty}