Sandhya,
If you think you can understand CR I would suggest you create a custom CR app. Anyway from what I can see the table is not properly extending the CR data model.
owner_id, creation_user, creation_date, last_modified are already covered by acs_objects. While title and pubdate are covered by cr_revisions. If you use CR you can create a content type by content_type__new then add the custom attributes author, copyright and edition.
You can read more about the CR here http://your host/doc/acs-content-repository/
In particular understand this diagram well.
http://yourhost/doc/acs-content-repository/object-model.html
If you still decide to use ETP the above is still applicable. I believe the define app is called at etp-init.tcl ... not sure though its been a while since I handled ETP. This makes use of acs_attributes table I believe. Good luck.
