The OFL has other clauses having to do specifically with typefaces. There is a clause that allows redistribution freely, sale of the typeface bundled with other products, but not sale of the typeface by itself. There is also a clause that requires changing the name of any modified versions of the typeface, meant to protect the good name of the original typeface if someone makes poor modifications, I would guess. That's my memory of the differences, aided by a quick scan of the license.

st

The two (the OFL and the GPL+font exception) are quite different, although both are valid free/libre and open source software licensing models for fonts. Although the GPL+font exception model is legally valid, we feel that it does not fit fonts well, and actually discourages the release of free/libre fonts, so we created the OFL. The philosophical differences are that the OFL does a better job of protecting designers in an understandable way and places less restrictions on the use of derivative works. That's a gross oversimplification, but gives you the general idea.

For a lot more detail, read the OFL itself carefully (it's a lot less wordy than the GPL), and consult the newly-updated OFL-FAQ.

@gaultney

OpenFontLibrary.org (has acronym OFL) and Open Font License (has acronym OFL) and the previous hosts on it's site some of the latter's license fonts. OpenFontLibrary.org updated the website and removed BBT font from it's URL. The font had to re-uploaded at OpenFontLibrary.org though another URL was given. Thus BBT font mentions with previous URL have to be forwarded to the new URL. Also OpenFontLibrary.org should put all the files that were there on the previous site and not only the font per se ones, for example a file contains this:

".....ABOUT BBT FONT

BBT Font is a Pro Bono (for the public good) Hare कrishna Ritviक Universal Religion Project for spiritual / philosophical reasons and thus any full or part technical or non-technical opensource resources and licenses used of Local Religion (e.g. Christianity, Islam, Judaism, Buddhism, Jainism) organisations and individuals and/or commercial organisation and individuals and/or
other non-profit organisations and individuals, they are considered donations to His Divine Grace A C Bhaकtivedanata Swami Prabhupada, Founder Acharya & Permanent Sole Initiator of the Hare कrishna Movement the permanent person, not the estate, state, representative/s or representative organisation/s etc.

This Font Software is Copyright (c) 2008, Copyright (c) Holder for the commissioned क / क design of the 11th glyph previously k / K is His Divine Grace A C Bhaकtivedanata Swami Prabhupada, Founder Acharya & Permanent Sole Initiator of the Hare कrishna Movement the permanent person, not the estate, state, representative/s or representative organisation/s etc. All Rights Reserved.
“BBT” is a Reserved Font Name for this Font Software.

This Font Software is licensed under the Open Font License, Version 1.0. No modification of the license is permitted, only verbatim copy is allowed. This license is copied below, and is also available with a FAQ with this Font Software.

Copyright (c) Holder for the commissioned क / क design of the 11th glyph previously k / K is His Divine Grace A C Bhaकtivedanata Swami Prabhupada, Founder Acharya & Permanent Sole Initiator of the Hare कrishna Movement the permanent person, not the estate, state, representative/s or representative organisation/s etc. Copyright (c) 2008, His Divine Grace A C Bhaकtivedanata Swami Prabhupada, Founder Acharya & Permanent Sole Initiator of the Hare कrishna Movement the permanent person, not the estate, state, representative/s or representative organisation/s etc (url: www.Prabhupada.name | email: fromtoccbcc -at- gmail -dot- com), with Reserved Font Name BBT.

Copyright (c) Holder for the other characters on the Typeface other than commissioned क / क design of the 11th glyph previously k / K is SIL, a Christian faith-based organisation in Dallas, Texas, USA. Copyright (c) 2008, SIL (url: www.sil.org | email: victor_gaultney@sil.org), with Reserved Font Names Gentium and SIL....."