Knowledge reuse has been highlighted as a major asset in the development of semantic resources (ontologies, thesauri, terminologies, knowledge bases) and semantically enriched datasets, namely annotated corpora. Reusing available resources reduces indeed production costs and enables to test the validity of models in different applicative contexts. However, sharing and reusing existing resources is sometimes hindered by intellectual property limitations and uncertainties, as well as by privacy concerns depending on the nature of the data. This paper analyses these issues in the framework of the LEGILOCAL project, which aims at enhancing citizen access to local regulations through semantic technologies.