[Trisquel-users] When licenses say nothing

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Background: Armando Marroquin created a good selection of chess fonts to  
create diagrams. But the README included with the files says surprisingly  
little about the licensing terms: "The font is freeware, I hope it is useful  
for the chess buddies." Perhaps he meant free software? People are  
redistributing modified and unmodified versions of his fonts all over the  
web, and there's not a word of restriction in the README.

I don't use material with no license ("Code with no license is non-free"),  
but I often come across vague licenses like "This software is freeware" and  
"Feel free to use or modify it as you wish" without any sign of restrictions.  
Should I use fonts like these?