From the site: "OPenn contains complete sets of high-resolution archival images of cultural heritage material from the collections of its contributing institutions, along with machine-readable descriptive and technical metadata. All materials on OPenn are in the public domain or released under Creative Commons licenses as Free Cultural Works. Please see specific repository pages and documents for applicable license terms."
Contained on the website are documents, document images, and images of cultural material made available for free by OPenn's affiliates. The material can be helpful for finding primary source material, either for lesson plans or to allow students to construct arguments or digital projects.