By saying "just like a book," Borland means, for example, that this software may be used by any number of people, and may be freely moved from one computer location to another, so long as there is no possibility of it being used at one location while it's being used at another or on a computer network by more than one user at one location. Just like a book can't be read by two different people in two different places at the same time, neither can the software be used by two different people in two different places at the same time.
Borland: No-Nonsense License Statement
(via Wikipedia: Turbo Pascal)