+ keywords that must be used when referring to the most frequent
+ exceptions. When exceptions other than these are in effect that modify
+ a common license by granting additional permissions, you may use an
+ arbitrary keyword not taken from the below list of keywords. When a
+ license differs from a common license because of added restrictions
+ rather than because of added permissions, a distinct short name should
+ be used instead of <literal>with
+ <varname><replaceable>keywords</replaceable></varname>exception</literal>.
+ </para>
+ <para>
+ Only one exception may be specified for each license within a given
+ license specification. If more than one exception applies to a single
+ license, an arbitrary short name must be used instead.