Frequently asked questions
Why can I only view a document?
Most documents on this site are copyrighted but the owner of the copyright is no longer identifiable. Therefore, the guidelines for "fair use of copyrighted materials" are followed. The documents are published on this site for educational purposes without any financial gain, and the publication is not intended to deprive anyone from receiving royalties from their work. To protect misuse of the documents, some documents can only be viewed and not copied, printed or modified.