I would like the build upon the Libertine Open Fonts Project under SIL OFL 1.1, a permission that seems to be intended by the authors. However, several issues / irregularities crop up in the wording of their license. These quotes are from various README and LICENCE files in two versions - the JAIST version (ftp.jaist.ac.jp/pub/CTAN/fonts/libertine) and the SourceForge version (sourceforge.net/projects/linuxlibertine/)
The original opentype fonts were created by Philipp H. Poll (gillian at linuxlibertine.org) and are licensed under the terms of the GNU General Public License (Version 2, with font exception) and under the terms of the Open Font License.
Does "and" mean that both licenses must apply? I have heard that GPL and SIL OFL are incompatible, and that opinion seems valid (to me) because the reserved name clause of OFL would constitute an additional restriction, disallowed by GPL.
Could "and" mean "either GPL or OFL, at my choice"? I suspect that this is the intent of the authors of the license declaration, but taking "and" to mean "or" is quite a stretch.
Our fonts are free in the sense of the GPL. ... Further information about the GPL (licence text with font exception see GPL.txt in this package). Additionally our fonts are licensed under the Open Fonts License (see OFL.txt).
Does "Additionally" mean "either GPL or OFL, at my choice"?
There are other issues ...
The JAIST LICENSE refers to OFL.txt, but that file is not in the distribution.
The SourceForge LICENSE refers to OFL.txt, but the file is named OFL-1.1.txt.
The LICENSE statement has the terms in two languages? Which is binding? (German and English are included in the LICENSE.txt file of both JAIST and SourceForge.)
Sorry for so many questions ... I'm really just trying to clear this font for further development under SIL OFL 1.1. These all seem to be stumbling blocks ...