Here is what Humboldt seed organization had to say: it's okay to sell /purchase but not germinate.
Humboldt Seed OrganizationThe laws vary by country, so you should be informed of the local laws before buying. It is illegal to germinate, in any country. Humboldtseeds.net sells seeds on the condition they are not put to germinate.
Questions about seed germination
Until laws do not legalize the cultivation of cannabis for personal use, germination will not be legal.
Humboldtseeds.net provides its seeds on the condition that they are not used by third parties against the law. Humboldt does not propose to induce anyone to act against the law. With this, we note explicitly that anyone buying our seeds are responsible for their future actions.
In Humboldt, we believe that there may be future legal changes. Only in this case, you can germinate your cannabis seeds legally.
https://www.humboldtseeds.net/en/faqs/