[gutvol-p] Hi, about filtering the license information.

Right now i'm preparing the filtering of the license information in from books downloaded from project Gutenberg, and i have 2 doubts: 1) I understand i can replace the license with this string ""This Ebook is for the use of anyone anywhere at no cost and with almost no restrictions whatsoever. You may copy it, give it away or re-use it under the terms of the Project Gutenberg License included in this eBook or online at www.gutenberg.net"" is that enough? 2) Is there any other markup beside the '_' to represent italic boundaries? And does this markup only occur in txt files?