How can we navigate through the information landscape that is only beginning to come into view? The question is more urgent than ever following the recent settlement between Google and the authors and publishers who were suing it for alleged breach of copyright. For the last four years, Google has been digitizing millions of books, including many covered by copyright, from the collections of major research libraries, and making the texts searchable online. The authors and publishers objected that digitizing constituted a violation of their copyrights. After lengthy negotiations, the plaintiffs and Google agreed on a settlement, which will have a profound effect on the way books reach readers for the foreseeable future. What will that future be?

No one knows, because the settlement is so complex that it is difficult to perceive the legal and economic contours in the new lay of the land. But those of us who are responsible for research libraries have a clear view of a common goal: we want to open up our collections and make them available to readers everywhere. How to get there? The only workable tactic may be vigilance: see as far ahead as you can; and while you keep your eye on the road, remember to look in the rearview mirror.

When I look backward, I fix my gaze on the eighteenth century, the Enlightenment, its faith in the power of knowledge, and the world of ideas in which it operated—what the enlightened referred to as the Republic of Letters.

The eighteenth century imagined the Republic of Letters as a realm with no police, no boundaries, and no inequalities other than those determined by talent. Anyone could join it by exercising the two main attributes of citizenship, writing and reading. Writers formulated ideas, and readers judged them. Thanks to the power of the printed word, the judgments spread in widening circles, and the strongest arguments won.

The word also spread by written letters, for the eighteenth century was a great era of epistolary exchange. Read through the correspondence of Voltaire, Rousseau, Franklin, and Jefferson—each filling about fifty volumes—and you can watch the Republic of Letters in operation. All four writers debated all the issues of their day in a steady stream of letters, which crisscrossed Europe and America in a transatlantic information network.

I especially enjoy the exchange of letters between Jefferson and Madison. They discussed everything, notably the American Constitution, which Madison was helping to write in Philadelphia while Jefferson was representing the new republic in Paris. They often wrote about books, for Jefferson loved to haunt the bookshops in the capital of the Republic of Letters, and he frequently bought books for his friend. The purchases included Diderot’s Encyclopédie, which Jefferson thought that he had got at a bargain price,…