What about the publisher’s copyright? - Paperight/website GitHub Wiki

Publishers, authors and rights brokers retain all existing copyright in their content. By placing a document on the website, you are only allowing outlets to acquire a very specific licence.

Each time a registered outlet requests the right to print or copy a publication that you are offering through Paperight, the outlet is granted a very limited licence to print or copy the number of copies of the document requested. If an outlet does not comply with the licence terms, its account with Paperight will be suspended.