As per this wikipedia article (see
Fonts section), only
pdf v1.6 and above is able to embed
opentype fonts in the document.
Now the problem is that, my institution requires
pdf /A-1b compliance which can be achieved through the
pdfx package. The problem is that its documentation discourages the use of an explicit option that sets this document version.
For example, if I need
pdf1.6, I could have simply passed the option
pdf16 to the package. From the documentation of the package:
pdf16: use PDF 1.6, overriding the version specified by the applicable standard. This may produce a non-standard-conforming PDF file`
I am using
libertinus open-type unicode fonts for my PhD thesis processed by
luatex (TL 2018). The unix command
pdfinfo says that the pdf version is only
1.5 which means the full
open-type features are not present in the document.
I really wish to embed
opentype fonts into the PDF whilst maintaining
PDF A/1-b compliance. Can I achieve this somehow?