The China Academic Digital Associative Library (CADAL) has books that are both in and out of copyright. It is explicit policy of the Universal Digital Library (CADAL) to adhere to the copyright policies of all countries in the strictest possible interpretation. In case there has been an unintentional violation of the policies of any country, we will immediately try to rectify the situation. We request all such notifications of the copyright violations to be sent by clicking on the copyright violation hyperlink on the book metadata displayed while searching.
We are using the following conservative guiding principles for displaying content.
1. For those books that are either out of copyright or permission to scan has been granted, we display the entire contents of the book free to read. We deem any book published before 1923 as being out of copyright.
2. For books under copyright, we only display the title page and other selected pages not exceeding 10% of the pages, under the fair use policy. We currently deem any book published after 1923 as being in copyright, unless:
a. The book is in public domain (e.g. government publications and other approved not-for-profit societies)
b. Explicit permission has been received from the author or publisher or
c. There is authenticated information to indicate that this book should not be in copyright.
An author or owner of a book published after 1923 can request that the entire content be displayed on the CADAL website. Please search and open the book in question in the homepage of this website. In the right side window, select copyright error link and provide all the relevant information.