These fonts are copyrighted, but are distributed under an open-source
compatible license.  In particular, this font is derived from Charis
SIL, and is distributed under the OFL (see the files OFL.txt and
OFL-FAQ.txt for details).  Charis SIL, in turn, is derived from
Bitstream Charter, which has a very liberal license, as described in 
Charter-copyright.txt.

There is one glyph not obtained from Charis SIL: The arrow was obtained
from DeajVuLGCSans 2.15, glyph 0x2192.  To the extent of my knowledge,
this glyph is public domain.