The texts on Folger’s site have a CC-BY-NC license, prohibiting commercial use. Wikisource seems to use CC-BY-SA, and the Gutenberg texts seem to be in the Pub

The texts on Folger’s site have a CC-BY-NC license, prohibiting commercial use. Wikisource seems to use CC-BY-SA, and the Gutenberg texts seem to be in the Public Domain as long as the name “Gutenberg” is removed from the text.