Abstract: The present invention relates to a method for the fast reconstruction of content information of a recording medium. According to the invention, the method comprises the steps of: determining a signature of the recording medium, the signature comprising a plurality of elements; comparing the signature with a plurality of signatures stored in a content database; and retrieving associated content information from the content database if the signature matches a signature stored in the content database.

Abstract: A method for removing metal contaminants from water uses lignin derivatives, such as lignosulfonates and kraft lignin, a coagulant, such as a metal salt, and a pH-increasing composition. The lignin derivative is dispersed in the contaminated water, the coagulant is added and the pH is adjusted as required to cause flocculation. A sludge is formed that contains the metals and that is separated from the treated water by filtration. Related methods are used to reduce the leachable metal content of contaminated soils. The invention also provides a composition for stabilizing the metal contaminants in soil, comprising lignin derivatives, a coagulant and a composition for increasing the pH. The mixture is blended with the contaminated soil, reducing its leachable metal content.