Hide my ass.

Disclaimer on the binary tree for CAs, that's not required to be like that.

book/ssl_prequisites.tex

@@ -18,7 +18,9 @@ a digital signature.
 In order to overcome the proliferation of keys to be distributed, and satisfy the
 use-case of a mindless user willing to accomplish a secure transaction on the
 internet, the following, hierarchical trust model proliferated (~\cite{rfc4158},
-Fig.2):
+Fig.2)\footnote{
+  The image is merely esemplificative, there is no boundary to the structure of
+  the tree.}:
 \\
 \\
 %% E` BELLISSIMO QUESTO COSO