Custom fonts are fine as long as they match the guidelines. I think they will have some issue-- mostly the ones that look different than the original icons (i.e

Custom fonts are fine as long as they match the guidelines. I think they will have some issue-- mostly the ones that look different than the original icons (i.e. the white outlined versions). https://twitter.com/logo https://twitter.com/logo https://github.com/logos https://github.com/logos https://www.facebookbrand.com/dos-donts https://www.facebookbrand.com/dos-donts http://www.apple.com/legal/sales-support/certification/docs/logo_guidelines.pdf http://www.apple.com/legal/sales-support/certification/docs/... Page 12 -- No go "Do not use the Apple logo alone in channel affiliate communications, including web pages." (I.e. You can't just show the Apple Icon) https://www.dropbox.com/branding https://www.dropbox.com/branding Yahoo's icon actually doesn't look like Yahoos brand icon so I would call that one a pass http://developer.android.com/distribute/googleplay/promote/brand.html http://developer.android.com/distribute/googleplay/promote/b... Pretty much no restrictions for the robot-- accept you need attribution according to Creative Commons 3.0 Attribution License. http://developer.linkedin.com/documents/branding-guidelines http://developer.linkedin.com/documents/branding-guidelines Linked in is specific in what the logo can be used for, instead of what it looks like. So this font is fine, but even in the preview the logo should point to a linked in page or profile. http://www.youtube.com/yt/brand/using-logo.html http://www.youtube.com/yt/brand/using-logo.html The logo the author used isn't the one trademarked-- fair use here. https://vine.co/logo https://vine.co/logo "Use only the official, unmodified files to represent our brand." So this ones a no (though it's confusing... what if the author used the original glyph? Is conversion considered modification? I suppose) http://www.microsoft.com/en-us/legal/intellectualproperty/Trademarks/Logo/Programs.aspx http://www.microsoft.com/en-us/legal/intellectualproperty/Tr... Unless that glyph isn't trademarked it's not okay to use, even the logos mentioned state: "Do not use in... Web sites for any purpose except pursuant to an express written trademark license from Microsoft." https://en.bitcoin.it/wiki/Promotional_graphics https://en.bitcoin.it/wiki/Promotional_graphics Bitcoins assets are fair game. http://dribbble.com/branding http://dribbble.com/branding Seems to be okay, since colors are 'encouraged' and the gylph is shown as ones that are okay to use. http://www.reddit.com/about/alien/ http://www.reddit.com/about/alien/ Absolutely no go: "We require a license to use these logos in anything outside reddit, both for free and for profit." --- Summing up here I was surprised to learn that the restrictions are more stringent than I thought. If I were the author I'd clean up the alternate version and remove the Glyphs that aren't specifically allowed, otherwise anyone who uses your font is technically opening themselves up to trademark violations.