This book is about how to run services, in any organisation, in any industry. It describes the basics, the core stuff, in realistic pragmatic terms. And it is pragmatically brief - we kept it to 50 paperback pages.
Playing "bush lawyer", I have been tracking down the terms under which OGC control the copyright to ITIL (discussed here recently). And it makes an interesting little story: ITIL was almost free. And I think maybe PRINCE2 is.