Setting up a legal framework for sharing materials: Sharing of materials in a scientific environment can be done in two ways: either via a donation of the material from one scientific group to another one, or via the transfer of material under certain negotiated conditions. The FAIR-AR samples concept supports both ways of sharing materials. Establishing the transfer of materials under an MTA costs more time and effort at the beginning of the sharing processbut enables the provision and re-use of compounds under clearly defined rules and is therefore the preferred way of sharing materials. Together with five exemplarily chosen partner sites, KIT elaborated a standard MTA several years ago, which is used as a routine process to introduce new partner sites to provide materials to the Molecule Archive. The MTA defines the rights of the material providers, it regulates intellectual property ownership, the handling of obtained or transmitted data, and the publication of results. This is in particular important if the re-users of the materials gain scientific results with the provided compounds, and these results should be published together.