Pali Canon Online (PCO) is a non-profit online archive of Buddhism-related materials. The materials on this website are provided by end users, and PCO is being proctected under the Digital Millennium Copyright Act (http://en.wikipedia.org/wiki/Digital_Mi ... yright_Act) and provides means to remove any materials that may infringe copyright if they are not within the "fair use" context.
PCO works to protect any uploaded materials with the guidance of "fair use." For examples, the materials the end users shared must be solely for studying, researching, or educational purposes, and non-profit in nature.
If you are not sure whether the material and nature fits "fair use," please consult with an experienced attorney.