Added DEP5 method for licensing information

user_guides/cern_ohl_s_v2_user_guide.tex

@@ -138,12 +138,15 @@ licensing information which will be easily visible to whoever opens them. For
 file types which do not easily grant that possibility, consider using a separate
 text file taking as its name the name of the original file with
 `.license'\footnote{Here we exceptionally use US spelling for the word `licence'
-  in order to be coherent with the REUSE project, which is where we got this
-  idea. See \href{https://reuse.software/}{https://reuse.software/} for
-  details.} appended to it. So if you have e.g. a file called
-`my\_3d\_design.FCStd', you can add another file in the same directory called
-`my\_3d\_design.FCStd.license' which is a text file containing copyright and
-licensing information.
+  in order to be coherent with the REUSE project.} appended to it. So if you
+have e.g. a file called `my\_3d\_design.FCStd', you can add another file in the
+same directory called `my\_3d\_design.FCStd.license' which is a text file
+containing copyright and licensing information. If the number of files in your
+project is large and the `.license' method is deemed too cumbersome, you can
+centralise all your licensing information in a single text file following the
+Debian DEP5 specification. Both the `.license' and the DEP5 methods are
+suggested in the REUSE guidelines. See
+\href{https://reuse.software/}{https://reuse.software/} for details.
 
 \begin{enumerate}[label=\textbf{\ref*{subsec:your-sources}.6}]
 \item \textbf{Rule: } include for each source file, either embedded in the file