Source: Wikipedia D6 Space available under the CC-BY-SA License. D6 Space was originally released in 2003 as a PDF format ebook under the name D6 Space Opera by Humanoids Publishing. It was sold as a core rulebook for their line of Shatterzone PDF re-releases. This was greatly expanded and revised by author Nikola Vrtis into the current D6 Space Rulebook (ISBN 978-1-932867-01-5), released in 2004 by Purgatory Publishing imprint West End Games.