The Humanities Digital Library is still in its early stages, but promises to be a useful source of open access material. Its web site states that:
The Humanities Digital Library is the open access library and catalogue for books published by the School of Advanced Study, University of London. It forms part of the School’s mission to embrace the opportunities of digital content delivery and enable greater access to knowledge. The Humanities Digital Library is managed by the Institute of Historical Research (IHR) and the Institute of Advanced Legal Studies (IALS).
Each book is available as an open access PDF (full text) but can also be purchased in print (hardback and paperback) or as an ebook (EPUB format). Scholarly content made available through the website includes monographs, edited collections and shorter form works.
The first law book to be made available via the Digital Library is Electronic Signatures in Law by Stephen Mason.