Why does it need a short version?
The short text makes it possible to pass on open-source licensed seed with little effort. The size of the text can be printed on the seed bag. It explains the most important conditions and refers to the complete licence text on the website. With acknowledgment of this text, the contract is concluded.

Seeds with the same rights and obligations for all

By acquiring or opening the packet of these plant seeds you accept, by way of an agreement, the provisions of a licence agreement where no costs shall be incurred to you. You especially undertake not to limit the use of these seeds and their enhancements, for instance by making a claim to plant variety rights or patent rights on the seeds’ components. You shall pass on the seeds, and propagations obtained therefrom, to third parties only on the terms and conditions of this licence. You will find the exact licensing provisions at www.opensourceseeds.org/licence. If you do not wish to accept these provisions, you need to refrain from acquiring and using these seeds.