Germany's book industry association is calling for tougher action against pirated copies of e-books.
Gottfried Honnefelder, head of the group that represents publishers and booksellers, said at the fair's opening news conference that around 60 percent of e-book downloads in Germany are pirated through Internet sources such as filesharing sites.
The e-book market remains tiny in Germany, with about 0.5 percent of the market. E-readers have not caught on as they have in the U.S., but there is plenty of potential there.
Some 7,400 exhibitors are expected for the fair Wednesday through Sunday, gossiping, sharing ideas, promoting their books, and trading in publishing and translation rights.
Iceland is this year's featured guest, with some 35 writers presenting their works.