RLOs are made shareable by the use of Creative Commons licenses, these are essentially a way for creators of any form of creative work, including books, songs and in this case teaching materials, to state how exactly they want to allow their work to be shared. The licenses range from public domain where anyone can use it for whatever purpose without attribution to the original author up to the most restrictive where a work can only be used for non-commercial purposes and cannot be changed or adapted in any way and needs an attribution to the author.
