This isn't directly applicable to the OP, but since a lot of readers are in the US, I thought I'd go into a bit more detail.<p>In the United States, compilations of data are protected by the Copyright statute.  Specifically, any "collection and assembling of preexisting materials or of data that are selected in such a way that the resulting work as a whole constitutes an original work of authorship".<p>The underlying data is not protectable, but the structure and method of assembly, once the data are incorporated is.  In Feist vs. Rural Telephone (499 U.S. 340 (1991)), the Supreme Court looked at what level of originality is required for a compilation to be protectable. The Court held that a white pages phone directory that is just a listing of numbers in a geographical area is not sufficiently original to be protected.  Basically, that kind of listing is just a recitation of existing facts in a logical order.<p>An important quote from that case sets out the factors for courts to consider in deciding what degree of originality is sufficient:<p>"The compilation author typically chooses which facts to include, in what order to place them, and how to arrange the collected data so that they may be used effectively by readers. These choices as to selection and arrangement, so long as they are made independently by the compiler and entail a minimal degree of creativity, are sufficiently original that Congress may protect such compilations through the copyright laws. "<p>As is often the case in the law, it doesn't give you a black and white answer, but instead gives a series of guidelines to follow.