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Which LaTeX fonts are open source? Someone told me they are all, but I am not sure...

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Note that TeX Live has a policy of only including 'free-as-in-license' material, so if the font is in TL you should be OK. –  Joseph Wright Feb 12 at 12:42
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Are you sure you’re looking for open source and not for something like with a liberal license, e.g. the SIL Open Font License? –  doncherry Feb 12 at 12:49
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Unless you have some development ideas in mind, being open-source does not seem to be what you are looking for. –  Hasan Zakeri Feb 12 at 20:22
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@JosephWright That's just not true. LPPL is certainly a licence, as is the GPL etc. In fact, TL has a policy of not including material with no clear licensing statement. (With the arguable exception of PD which is not exactly a licence.) What matters is the content of the licence. I spent a while trying to trace authors of older packages precisely in order to try to persuade them to add a licence so that their packages would not be removed from TL. Without a licence, nobody has any right to do anything with their code. –  cfr Feb 12 at 22:01
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@JosephWright I did assume you meant something else but I find 'license free' misleading/confusing. I find it difficult to hear it as anything but 'licence-free'. It suggests to me that there are no restrictions on what may be done with the material but that's obviously false. –  cfr Feb 12 at 22:28
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1 Answer

up vote 18 down vote accepted

You can check the li­cense for each and every font on CTAN. Go to the fonts section: ctan.org/topic/font, find the font you are interested in and check how it is licensed. If in doubt do consult the documentation! (Another good starting place is The LaTeX Font Catalogue. Just follow the links from there to CTAN.)

An example: The li­cense information for EB Garamond can be found under: www.ctan.org/tex-archive/fonts/ebgaramond

EB Garamond information on CTAN

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Note that this isn't always enough. Sometimes you need to read the documentation e.g. some packages use one licence for the fonts and one for the support files. In those cases, the CTAN tag will just indicate something generic (e.g. 'other free') and you need to look further for details. –  cfr Feb 12 at 22:09
    
You are right: reading -- and especially understanding -- the documentation is advantageous. –  DG' Feb 13 at 8:54
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