flower breeder who protects their variety in the Netherlands could block importation of cut flowers of that variety into the Netherlands from Egypt, which does not grant plant breeders' rights, because the breeder had no opportunity to exercise any rights in Egypt. Member countries also have the option to require the breeder's authorization with respect to the specified acts as applied to products directly obtained from the harvested material (such as flour or oil from grain, or juice from fruit), unless the breeder has had reasonable opportunity to exercise their right in relation to the harvested material. The UPOV Convention also establishes a multilateral system of national treatment, under which citizens of any member state are treated as citizens of all member states for the purpose of obtaining plant breeders rights. It also sets up a multilateral priority filing system, under which an application for protection filed in one member state establishes a filing date for applications filed in all other member states within one year of that original filing date. This allows a breeder to file in any one member country within the one-year period required to preserve the novelty of their variety, and the novelty of the variety will still be recognized when the filing is done in other member countries within one year of the original filing date. However, if the applicant does not wish to make use of priority filing, he or she has four years in which to apply in all other member states, excepting the United States, for all species except tree and vine species in which case he or she has six years to make application. More information can be obtained in Article 10 (1) (b) of Council Regulation (EC) No. 2100/94 of 27 July 2004. The trigger to start the four- or six-year period is not actually the date on which the first filing is made but the date on which the variety was first commercialised. The UPOV Convention is not self-executing. Each member state must adopt legislation consistent with the requirements of the convention and submit that legislation to the UPOV Secretariat for review and approval by the UPOV Council, which consists of all the UPOV member states acting in committee. In compliance with these treaty obligations, the United Kingdom enacted the Plant Variety and Seeds Act 1964. Similar legislation was passed in the Netherlands, Denmark, Germany, and New Zealand. In