As someone working in Germany, that seems unlikely to me. A works council influenced by the company would like be struck down quickly, senior/mid management (e.g. directors and up) are even disallowed to participate/be elected as far as I know.
Its more likely to me that they use that copyright as they are an official and legal part of the company as works council.
Its more likely to me that they use that copyright as they are an official and legal part of the company as works council.