(1) Where several persons have jointly created a work without it being possible to separately exploit their individual shares in the work, they are joint authors of the work.
(2) The right of publication and of exploitation of the work accrues jointly to the joint authors; alterations to the work are permitted only with the joint authors’ consent. However, a joint author may not refuse consent to publication, exploitation or alteration contrary to the principles of good faith. Each joint author is entitled to assert claims arising from violations of the joint copyright; a joint author may, however, demand performance only to all the joint authors.
(3) Proceeds derived from the use of the work are due to the joint authors in accordance with the extent of their involvement in the creation of the work, unless otherwise agreed between the joint authors.
(4) Joint authors may each waive their share of the exploitation rights (section 15). They must make a declaration of waiver to the other joint authors. Upon such declaration being made their share accrues to the other joint authors.