The lawyer (or other person) who wrote this was using a typical "ellipsis", as Spanish lawyers often do. The full title of this law is:

"Ley 34/2002, de 11 de julio, de servicios de la sociedad de la información y de comercio electrónico"

so, I think this is an accurate rendering.

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Note added at 3 hrs (2008-08-13 14:30:52 GMT)
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I believe you will see that this the law does not refer to companies offering info(rmation) services. The expression "la sociedad de la información " refers to "the information society" and is not company ("empresa") in this context.

Europe's Information Society Portal
Visit the Information Society newsroom for all the latest news. Subscribe to the Newsroom ... What is the Information Society? Newcomer's guide ...
ec.europa.eu/information_society/

World Summit on the Information Society : About WSIS
BASIC INFORMATION : ABOUT WSIS Overview The UN General Assembly Resolution 56/183 (21 December 2001) endorsed the holding of the World Summit on the ...
www.itu.int/wsis/basic/about.html

Information Society Commission - Homepage
Advisory commission working to shape public policy framework for the "Information Society"; and promote awareness of the opportunities presented by ...
www.isc.ie/

+ 1,970,000 google hits for "information society"

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Note added at 9 hrs (2008-08-13 21:24:11 GMT)
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Noelia, to answer your question, this is a law passed in 2002 to regulate information society and electronic commerce services. Article 1 of the law states:

"Es objeto de la presente Ley la regulación del régimen jurídico de los servicios de la sociedad de la información y de la contratación por vía electrónica, en lo referente a las obligaciones de los prestadores de servicios incluidos los que actúen como intermediarios en la transmisión de contenidos por las redes de telecomunicaciones, las comunicaciones comerciales por vía electrónica, la información previa y posterior a la celebración de contratos electrónicos, las condiciones relativas a su validez y eficacia y el régimen sancionador aplicable a los prestadores de servicios de la sociedad de la información."

If you would like to look at the contents of the law, the entire text is available on Internet at:

http://noticias.juridicas.com/base_datos/Admin/l34-2002.t1.h...