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GPL for seeds

Heard an interesting story about how some university seed breeders borrowed the idea of opensource from computer industry to seeds.

Plant Breeders Release First 'Open Source Seeds'

In US and world farming is leading more towards monocultures  and we need more diversity. Not sure how much this open source seeds initiative will work but I wish it becomes as successful as open source software. The good thing is that it works like GPL where if you use any of these seeds to produce a new seed then you cant patent it and you have to open source that also, what a brilliant idea :).  As per wikipedia http://en.wikipedia.org/wiki/GNU_General_Public_License

"""
David A. Wheeler argues that the copyleft provided by the GPL was crucial to the success of Linux-based systems, giving the programmers who contributed to the kernel the assurance that their work would benefit the whole world and remain free, rather than being exploited by software companies that would not have to give anything back to the community.[11]

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I wish this open source seeds project get same success as linux.

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