===Copyright Length===
Our understanding is that the copyright expiry for published books is calculated as follows:
:before 1911 - 42 years from the publication of the work or the life of the author + 7 years (What ever whatever was longer).
:from 1911 on wards - Life of the author + 70 years
It is our assumption that books published prior to 1911 are out of copyright and hence we can use their artwork here in the compendium. A list of these books can be found in the Category list below.<br>