Current font and image assets have an ambiguous copyright status.

[HexDecimal]

The assets in data/img and data/fonts need to be replaced with new assets which need a more clear license for international use. The origins of the current assets are unclear, with some names implying they're derived from Microsoft fonts.

Generally, every font derived from a proprietary TrueType font needs to be removed.

• Arial: Microsoft font, and should be removed.
• Caeldera: Non-free font and should be removed.
• Celtic Garamond: Non-free font and should be removed.
• Consolas: Microsoft font, and should be removed. Could be replaced by Inconsolata.
• Courier: This font could be free, but you'd need to know which specific version of the font was used. Otherwise this will need to be removed.
• DejaVu: This is a known free font.
• Dundalk: Non-free font and should be removed.
• Lucida: Non-free font and should be removed.
• Prestige: Non-free font and should be removed.
• Terminal: Looks like it's based off of older DOS fonts. They don't seem to match the SDL Fonts pacakge. I'll need to do more research or replace the font.

Some images from data/fonts:

• circle.png: Looks like engineering art used to test the colors on libtcod.
• skull.png: At best I can trace this back to here, should probably be replaced by some actual clip art with a more clear copyright.

[HexDecimal]

The current credits are here:

libtcod/LIBTCOD-CREDITS.txt

Lines 48 to 52 in 1e0675a

	Fonts :
	The celtic garamond and dundalk fonts are from 1001freefonts.com.
	The caeldera font is from blambot.com.
	Other fonts are included in windows.
	The celtic_garamond, arial, courier, dejavu, consolas, prestige and lucida 10x10/12x12 bitmap fonts were created by Mingos.

This mostly confirms what I've already thought so far. Some of the special glyphs are likely hand-made, but the standard glyphs are from fonts which are non-free.