In case of works of joint–authorship, in which the shares of authors may not be separated, all the joint–authors shall be deemed equal authors of the work; unless otherwise agreed upon in writing. In which case, no author may singularly exercise the copyrights; unless pursuant to a written agreement there between.
The duration is the artist’s life with the addition of 50 years, starting from the beginning of the calendar year following the artist’s date of passing
YES, highly recommended in order to be effective against third parties.
YES. Penalties include payment of fines and legal prosecutions resulting in no less than 3-months imprisonment terms.