Works fall into the public domain 70 years after the death of the author. This does not always mean that no further authorisation needs to be requested to use the work and that no payment can be demanded for its use.
Other intellectual property rights may remain on the work, such as the rights of performers or producers. In such cases, it will be necessary to ensure that these rights are respected by obtaining the authorisations of the latter (or the bodies that manage the rights to these protected subject matters).
Sometimes contents are distributed to the public with the mention "public domain works". Often these works are still protected by copyright and the public domain designation is intended to grant free use of the work. In this case, it is useful to check the actual conditions of this authorisation, which may be limited to, for example, strict private use.