Academic Free License

{{short description|Permissive free software license}}

{{Use American English|date=March 2021}}

{{Use mdy dates|date=March 2021}}

{{Infobox software license

| name = Academic Free License

| author = Lawrence E. Rosen

| version = 1.2, 2.1, 3.0

| copyright = Lawrence E. Rosen

| date = 2002

| spdx = AFL-3.0
AFL-2.1
AFL-2.0
AFL-1.2
AFL-1.1

| OSI approved = Yes

| Debian approved = ?

| Free Software = Yes

| GPL compatible = No

| copyleft = No

| linking = Yes

}}

The Academic Free License (AFL) is a permissive free software license written in 2002 by Lawrence E. Rosen, a former general counsel of the Open Source Initiative (OSI).

The license grants similar rights to the BSD, MIT, UoI/NCSA and Apache licenses{{snd}} licenses allowing the software to be made proprietary{{snd}} but was written to correct perceived problems with those licenses. The AFL:

• makes clear what software is being licensed by including a statement following the software's copyright notice;
• includes a complete copyright grant to the software;
• contains a complete patent grant to the software;
• makes clear that no trademark rights are granted to the licensor's trademarks;
• warrants that the licensor either owns the copyright or is distributing the software under a license;
• is itself copyrighted, with the right granted to copy and distribute without modification.

The Free Software Foundation consider all AFL versions up to and including 3.0 as incompatible with the GNU GPL.{{cite web|url=https://www.gnu.org/licenses/license-list.html |title=Various Licenses and Comments about Them |access-date=October 20, 2011 |last=Stallman |first=Richard |publisher=Free Software Foundation }} though Eric S. Raymond (a co-founder of the OSI) contends that AFL 3.0 is GPL compatible.{{cite web|url=http://www.catb.org/~esr/Licensing-HOWTO.html#id2853340|title=Licensing HOWTO |access-date=May 15, 2010| archive-url= https://web.archive.org/web/20100402084554/http://www.catb.org/~esr/Licensing-HOWTO.html| archive-date= 2 April 2010 | url-status= live}} In late 2002, an OSI working draft considered it a "best practice" license.{{cite web|url=http://www.catb.org/~esr/Licensing-HOWTO.html |title=Licensing HOWTO |access-date=July 7, 2007 |last=Raymond |first=Eric |date=November 9, 2002 | archive-url= https://web.archive.org/web/20070704015946/http://www.catb.org/~esr/Licensing-HOWTO.html| archive-date= 4 July 2007 | url-status= live}} In mid-2006, however, the OSI's License Proliferation Committee found it "redundant with more popular licenses",{{cite web|url=http://opensource.org/licenses/AFL-3.0 |title=Academic Free License 3.0 |access-date=January 18, 2016 |publisher=Open Source Initiative}} specifically version 2 of the Apache Software License.