The purpose of Wikilivres is to host texts and images in the public domain, or under a free licence. This site is hosted and managed in Canada and therefore it follows Canadian copyright law. You are welcome to publish texts here if they cannot be accepted in Wikisource. Texts that can be accepted in Wikisource should be published there.
Wikilivres does not belong to the Wikimedia Foundation.
The compilation don't have a clear copyleft licensing terms at the time of writing this note, but it's individual contents should be in public domain or in a copyleft license, per http://wikilivres.ca/wiki/Wikilivres:Copyrights . You will need to research for individual licensing terms or in the live wiki or in the related data dumps for the respecting description page of each one. Failure on doing it may put you on copyright infringement