Section one of this page lists copyright resources helpful in an academic environment. Section two tells you how to determine if a given work is still protected by copyright law.
The copyright office at the Library of Congress is one of the most authoritative copyright websites on the net. This easily navigable site is especially useful for applying for copyright, viewing the copyright law, and searching copyright records. Be sure to read circular one (a good intro to copyright law) and circular 21 which explains fair use provisions of the law in an educational context. This site is always uptodate. Supplement LC with the following sites geared specifically to copyright in an educational, non-profit context.
Here is our understanding of the law. Keep in mind this summary only applies to published paper-and-ink books/articles, not music, movies, electronic/digital works, unpublished works, works for hire, or other exceptional situations. The library cannot offer legal advice and we do not guarantee the accuracy of this summary, but we have tried to be accurate. If you believe a correction is needed, contact us.
Books copyrighted in the US before 1923 are now in the public domain; their copyrights have expired and it is legal to copy such works.
Books initially copyrighted in the US from 1923 through 1963 are still protected by copyright law if the initial copyright was renewed. The initial copyright term was 28 years and the renewal was 67 more years (formerly only 47 years). For example, a book initially copyrighted in 1923, and renewed, will pass into the public domain in 2019 (i.e., 1923+28+67+1).
All books initially copyrighted in the US from 1964 through 1977 have had their copyrights automatically renewed (by law) and the copyrights are still in force. The initial copyright term was 28 years; the renewal was for 67 more years. So a book initially copyrighted in 1964 will pass into the public domain in 1964 + 28 + 67 + 1= 2060.
All books initially copyrighted in the US from 1978 to date are still protected by copyright law. The period of copyright protection is governed by complex rules. Generally speaking copyright protection ends 70 years after death of author.
| Initial US copyright | Current copyright status |
| before 1923 | no longer protected by copyright |
| 1923-1963 | Still protected by copyright law if renewed; check for renewal at Standford Copyright Renewal Database and the U Penn Catalog of Copyright Entries and the Library of Congress Copyright Database to cover the entire date range. |
| 1964-1977 | Still protected by copyright law. Protected 28+67=95 years from initial copyright date. |
| 1978- | Still protected by copyright law. The period of copyright protection is governed by complex rules. Generally speaking copyright protection ends 70 years after death of author. |
For a similar but more detailed table, see When Works Pass into the Public Domain at the Cornell Copyright Info Center.
Finally, remember, it may be easier to ask the copyright holder for permission to copy than to research the status of a work. Also, keep in mind that the "fair use" provisions of the law are very generous to those copying for educational, not-for-profit purposes. For additional information, see circular 21 which explains fair use provisions of the law in an educational context.