Odrac is a modified version of the Cardo font, where glyphs are reversed so they can be read using a mirror.
Cardo - the original - is a serif typeface created by David J. Perry. It is released under the SIL Open Font License, Version 1.1, with Reserved Font Name Cardo.
The original Cardo font can be found here: http://scholarsfonts.net/cardofnt.html
Copyright (c) 2013, Manuel Schmalstieg (greyscalepress.com) Copyright (c) 2004–2011, David J. Perry (scholarsfonts.net) The Font Software Odrac is released under the SIL Open Font License, Version 1.1, with no Reserved Font Name.
You are free to use, modify and distribute it, under the terms of the SIL Open Font License.
This license is available with a FAQ at: http://scripts.sil.org/OFL
Why are there several TTF files with different numbers? Why are the numbers part of the font name?
I wanted to be able to load them simultaneously in typesetting software. This wouldn't be possible if the files had the same font name.