(4)The increasingly diverse forms of public action have made it necessary to define more clearly the notion of procurement itself; that clarification should not however broaden the scope of this Directive compared to that of Directive 2004/18/EC. The Union rules on public procurement are not intended to cover all forms of disbursement of public funds, but only those aimed at the acquisition of works, supplies or services for consideration by means of a public contract. It should be clarified that such acquisitions of works, supplies or services should be subject to this Directive whether they are implemented through purchase, leasing or other contractual forms. The notion of acquisition should be understood broadly in the sense of obtaining the benefits of the works, supplies or services in question, not necessarily requiring a transfer of ownership to the contracting authorities. Furthermore, the mere financing, in particular through grants, of an activity, which is frequently linked to the obligation to reimburse the amounts received where they are not used for the purposes intended, does not usually fall within the scope of the public procurement rules. Similarly, situations where all operators fulfilling certain conditions are entitled to perform a given task, without any selectivity, such as customer choice and service voucher systems, should not be understood as being procurement but simple authorisation schemes (for instance licences for medicines or medical services).