This license is based on the concept of copyleft, as described by various documents linked to by Philosophy of the GNU Project on the GNU website (http://www.gnu.org/). Its purpose is similiar to some of the GNU Licenses (the GNU General Public License in particular) and other copyleft licenses.
1. Verbatim copying and distribution of documents covered by this license is permitted in any medium, provided this document is included.
2. Creation of new documents via modification of documents covered by this license is allowed, provided that (a) all original documents are included in their original form, and (b) proper credit is given.