The European Patent Office has revoked a false patent on genetically modified (GMO) melons held by Monsanto, the world’s largest seed company, after a Jan. 20 public hearing in Munich, Germany.

The Europe-based coalition No Patents on Seeds spearheaded the opposition. According to a press release from the organization, Monsanto claimed that melons with a natural resistance to plant viruses was its own invention even though the resistance was already detected in indigenous melon varieties in India.

As the The Hindu explained:

Melons have a natural resistance to certain plant viruses. In the case of Cucurbit Yellow Stunting Disorder virus (CYSDV)—which has been spreading through North America, Europe and North Africa for several years—certain melons are known to be naturally resistant to it. Using conventional breeding methods, this type of resistance was introduced from an Indian melon to other melons and has now been patented as a Monsanto “invention.”

Opponents feared that by arming itself with this patent—”closterovirus-resistant melon plants,” or EP1962578, issued May 2011—the St. Louis-based agribusiness “could block access to all breeding material inheriting the virus resistance derived from the Indian melon,” The Hindu reported.

No Patents on Seeds argued that Monsanto’s patent was awarded to the company even though European patent law does not allow patents on plant varieties and processes for conventional breeding.

“The patent was based on essentially biological processes for breeding and claimed plant varieties. This was a clear violation of European patent law,” said No Patents on Seeds coordinator Christoph Then in a statement.

He added that revocation of the patent was “a huge success,” however, “politicians need to make sure that laws are applied properly and prohibitions are no longer ignored.”

Not only that, the melon’s natural resistance to closterovirus has already been catalogued for several decades before Monsanto stepped in. As FruitNet.com observed: “The gene responsible for this resistance was first found in a melon plant in India catalogued in 1961, the [European Patent Office] conceded, and plant containing that gene have been publicly available since 1966.”