User's Guide
Page 184
....guess, config.sub, ltconfig, ltmain.sh). It appears that very many implementations will support it is unlikely that the arithmetic coding option of the JPEG spec is also freely distributable. without obtaining one or more licenses. COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: If you modify libpng you may insert additional notices immediately...
....guess, config.sub, ltconfig, ltmain.sh). It appears that very many implementations will support it is unlikely that the arithmetic coding option of the JPEG spec is also freely distributable. without obtaining one or more licenses. COPYRIGHT NOTICE, DISCLAIMER, and LICENSE: If you modify libpng you may insert additional notices immediately...