This allowed plant breeders to protect their new varieties from piracy and plagiarism, and to license these new varieties to others for commercial purposes. The protection provided by the Plant Varieties and Seed Act1964 was weaker than patents; for instance, the rights did not extend to the use of a protected variety but only to its sale. It was recognized in Europe and elsewhere that the plant breeding is not an 'inventive' process (as in industry) and therefore, a plant variety is not patentable, but can be protected by Plant Breeders' Rights (PBRs), provided it fulfils, the criteria of distinctness, uniformity and stability (DUS), In revised criteria adopted in UPOV 199 I, novelty has been added to this list of criteria (UPOV, 1991).
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