There have been two pixmap font submissions lately that concern me.

complete-unicode-plane-0-bitmap-font-png submitted the bitmap version of a GPL font under cc0.

pixel-pirate-font appears to be ccbysa-licensed but is based on (Disney-owned?) dafont.com/pieces-of-eight.font.

There seems to be no copyright for bitmap fonts in the US but what about other forms of protection and other countries' laws? Some information outlined in en.wikipedia.org/wiki/Intellectual_property_protection_of_typefaces.

It seems to me that we have to either

1. reject art that has other levels of protection (design patent, trademark...) or country-specific limitations or
2. include a warning about such issues.

(I'm also not sure that the non-copyrightable status of fonts was intended for fonts that are not designed for readability.)