Accsupp is an experimental package that provides a low level interfaces for programmers to tag page fragments in PDF documents to improve their accessibility. In other words, it helps making PDF documents generated from LaTeX sources compliant with PDF/UA, and therefore accessible!
Unfortunately, accsupp must be leveraged at a very low level in the LaTeX typesetting process in order to get acceptable results; therefore, you often need to “patch” existing LaTeX commands and TeX primitives.
WARNING: generating accessible PDF documents out of LaTeX files is a complex task. Such complexity depends on various factors: therefore, you can get results with varying quality degree.