Recital 37 Considering the variety of works and other subject matter in the collections of cultural heritage institutions, it is important that the licensing mechanisms and the exception or limitation provided for by this Directive are available and can be used in practice for different types of works and other subject matter, including photographs, software, phonograms, audiovisual works and unique works of art, including where they have never been commercially available. Never-in-commerce works can include posters, leaflets, trench journals or amateur audiovisual works, but also unpublished works or other subject matter, without prejudice to other applicable legal constraints, such as national rules on moral rights. When a work or other subject matter is available in any of its different versions, such as subsequent editions of literary works and alternate cuts of cinematographic works, or in any of its different manifestations, such as digital and printed formats of the same work, that work or other subject matter should not be considered out of commerce. Conversely, the commercial availability of adaptations, including other language versions or audiovisual adaptations of a literary work, should not preclude a work or other subject matter from being deemed to be out of commerce in a given language. In order to reflect the specificities of different types of works and other subject matter as regards modes of publication and distribution, and to facilitate the usability of those mechanisms, specific requirements and procedures might have to be established for the practical application of those licensing mechanisms, such as a requirement for a certain time period to have elapsed since the work or other subject matter was first commercially available. It is appropriate that Member States consult rightholders, cultural heritage institutions and collective management organisations when establishing such requirements and procedures.