[slf4j-announce] Retroactive (and optional) licensing change

Ceki Gülcü listid at qos.ch
Tue Feb 6 19:40:33 CET 2007

Hello all,

While we always claimed that [1] that the SLF4J license is identical
to the terms of the MIT License [2], Simon Kaegi observed that the
"sublicense" right was removed from the actual license as published on
our site. This was an unintentional omission that I was fixed in a
recent SVN commit [3].

I also updated the copyright dates and removed SLF4J.org as a
copyright holder since SLF4J.ORG does not exist as a legal entity
(only QOS.ch does).

I also corrected the discrepancy between the license as published in
[1] and the license included in the SLF4J distributions [3] which
included the UC Berkeley advertising clause, a leftover form the early
days where SLF4H was licensed under BSD.

To cut a long story short, all LICENSE.txt files shipping are now
identical copies containing exactly the same terms as the MIT license.

I would also like to *publicly* state that the terms of the MIT
license as reproduced in [3] may be retroactively applied to all versions
of SLF4J, including to 1.0, 1.1, 1.2 as well as the upcoming 1.3. If
for one reason or another you choose to be bound by the terms of the
license as it currently exists in versions 1.0, 1.1 and 1.2 (without
the sublicensing clause), you may continue to do so.

I hope this clarifies our position with respect to the licensing
terms of the SLF4J project.

[1] http://slf4j.org/license.html
[2] http://en.wikipedia.org/wiki/MIT_License

Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.

More information about the announce mailing list