This license was found on the "charter" texlive 2010 component. It is a Free font license, GPL compatible.
This is a copy of the Charter Type-1 fonts which Bitstream contributed to the X consortium, renamed for use with TeX. (c) Copyright 1989-1992, Bitstream Inc., Cambridge, MA. You are hereby granted permission under all Bitstream propriety rights to use, copy, modify, sublicense, sell, and redistribute the 4 Bitstream Charter (r) Type 1 outline fonts for any purpose and without restriction; provided, that this notice is left intact on all copies of such fonts and that Bitstream's trademark is acknowledged as shown below on all unmodified copies of the 4 Charter Type 1 fonts. BITSTREAM CHARTER is a registered trademark of Bitstream Inc. TeX metrics, virtual fonts and LaTeX font definition files can be found in the archive CTAN:fonts/metrics/freenfss.zip.