You are free to quote site material per Fair Use Guidelines. Site content is available under the Attribution-NonCommercial-NoDerivatives 4.0 International license, meaning that you are free to quote site content so long as it is attributed, non-commercial, and without derivatives.
All writing belongs to the writers of that content; and each article is to be considered authored by the contributors to that article. This protects the rights of each contributor here to their authored content, and they are of course free to manage that content as they see fit; moving it to other sites or using it in commercial products while having full ownership of it.
This site's licenses should be construed to allow reasonable, non-commercial, attributed, fair use quotation of site material so long as there are no derivatives while preserving and protecting all rights of website editors to their respectively authored writing.
While most images are clearly licensed as public domain, others of archaeological artifacts are so old that they are in the public domain. This site's position is the same as that of the Brooklyn Museum, that "Works created by United States and non-United States nationals published prior to 1923 are in the public domain, subject to the terms of any applicable treaty or agreement." Simple images of ancient archaeological artifacts are considered within the public domain--nonetheless I provide photographer names when possible, as well as links to websites where the photograph was officially found. Since I only provide small, lower-quality images of archaeological artifacts (with the exception of images from Wikimedia Commons), I encourage those seeking higher-resolution images to visit the source sites.