“Patterns in license usage have changed over time. Figure 1, above, shows how CC BY has become the most popular license in recent years, accounting for just over 65% of books published by OASPA members in 2020. CC BY-NC-ND was the next most commonly-used license, accounting for around 25% of books published in 2020….
5 publishers account for around 71% of OASPA members’ book output. This represents a similar level of consolidation to journals, although the top publishers are different between the two (with the exception of Springer Nature, T&F and De Gruyter). The next 5 publishers account for a further 18% of books; 12 publishers account for the remaining 11%. Full details of these additional publishers, together with the numbers of books for all publishers, can again be found in the downloadable data linked to above….”