If you want to reuse content or images from a publication, you always need permission first.
Copyright is the exclusive right of the creator to publish and make copies of this work. Copyright aims to protect the authors of a work and to stimulate the distribution of their work. So, a work is automatically considered "all rights reserved" in the eyes of copyright law.
But if you want others to reuse your work you could choose a Creative Commons license:
CC license icons licensed under a Creative Commons Attribution 4.0 International license.
More information regarding Creative Commons: https://creativecommons.org/share-your-work/