It seems obvious that the law should be obeyed in libraries, as in any other service open to the public. However, the lack of a clear legal framework governing certain notions does not always enable library managers to decide what is authorised and what isn't. In fact, there is very little in the way of legal precedent on libraries. The concept of legal risk, familiar to librarians in the English-speaking world, is little known in France. This raises the problem of the compatibility of library content and technology, which is particularly significant in the digital world, leading to innovations that are sometimes on shaky legal ground.