Header of files contains: <!-- (C) International Organization for Standardization 1986 Permission to copy in any form is granted for use with conforming SGML systems and applications as defined in ISO 8879, provided this notice is included in all copies. --> We should pull this into a "COPYRIGHT" file and place it in /usr/doc/sgml-commmon*.
fixed in sgml-tools 1.0.9-5 and later.