"Xero's Proof", created using FontStruct, is a Donationware font.
For usage, pick one or both of the following:
1. FOR ANY USAGE: Donate any sum of money to Andrew McCluskey via PayPal: email@example.com
(Suggested: GBP£8 / US$10 / €10). If you can, please make it as much as you feel it's worth and it will bring to your usages of it.
2. FOR NON-COMMERCIAL OR NON-PROFIT USAGE: Same as above, OR just let me know that you're using the font, via email to firstname.lastname@example.org
, with a tweet to @NALGames, or through DaFont directly! You don't need to attach any samples of the work, though if you can, it is highly appreciated, so thank-you. Just mentioning what you're using it for is preferred but not necessary.
This grants you, or the organisation/etc you represent, the ability to use this font infinitely for non-commercial/non-profit (option 2) or anything whatsoever (option 1). I do not restrict what you want to use it for, anything goes.
You may redistribute this font, but please let me know via email@example.com
(I won't prohibit redistribution under any circumstance) and please include everything contained within the .zip folder the font was downloaded in. Plus...