[slf4j-dev] licensing

[Ceki Gülcü]

Hello Espák,

On 04/01/2010 1:09 PM, Espák Miklós wrote:
> Hi,
>
> I am developing a framework over Prolog APIs for Java. It is a facade
> for Prolog implementations, just like SLF4J is for logging APIs.
>
> I used some code from SLF4J, and I have modified that for my purposes.
> I renamed the files (e.g. LoggerFactory to ProverFactory).
>
> I want to release the software under LGPL. The MIT license of SLF4J
> permits this.
>
> Which of the following is the correct way of doing this?
>
> 1. I drop the MIT licence, and use LGPL, reserving the copyright
> statement of the original authors, and adding my copyright, e.g. in
> the following way:
>      "Copyright by<me>, under LGPL License. Credits to XY for the
> original code of ZYX from library SLF4J.

As far as I know, as long as you keep the original copyright, you
would be complying with the license, as it explicitly allows
sub-licensing. However, you may not remove the existing copyright.

> 2. I keep the MIT licence and the copyright statement of the original
> authors and add my copyright because of the modifications. This way
> certain files would be licenced under the MIT licence, and most of the
> source files under LGPL.
>
> I would prefer the first version, if possible, so that I do not need
> to use several licences in the same project.

Option 1 is fine.

> Regards,
>
> Miklos Espak