http://packages.qa.debian.org/l/latex-xft-fonts.html.
The latex-xft bundle is published under the GPL.
+ In addition to the BaKoMa fonts, this font bundle contains the esint font
+ 'esint10.ttf' from the esint package. It was converted from the type1
+ version available at http://www.ctan.org/tex-archive/fonts/ps-type1/esint/.
+ This PostScript Type 1 implementation of the font esint10, originally
+ created by Eddie Saudrais using METAFONT, is freely available for general
+ use.
+
Ekkehart Schlicht
schlicht@lmu.de