1. A method for supplying authenticated font subsets, comprising the following steps: constructing an authentication tree for a font; subsetting the font to form a font subset; and distributing the font subset together with at least one authentication value of the authentication tree that represents portions of the font that are not contained in the font subset.
1. A method for supplying authenticated font subsets, comprising the following steps: constructing an authentication tree for a font; subsetting the font to form a font subset; and distributing the font subset together with at least one authentication value of the authentication tree that represents portions of the font that are not contained in the font subset. 2. A method as recited in claim 1 wherein the constructing step comprises the following steps: constructing one or more intermediate authentication trees for tables in a font file; and constructing the authentication tree from the intermediate authentication trees.