Typically, seed is treated with plant protection products and possibly nutrients before sale.
Suppliers of certified hemp seeds for cultivation
Giesen Crop Research (Angeren), Joris Giesen, www.giesencropresearch.nl
Enecta (Italy), https://www.enecta.com/pages/enecta-hemp-seed
Hemp-it (France), https://www.hemp-it.coop/en/ (see the section above on the Seed Catalogue)
Hempoint (Czech Republic), https://hempoint.cz/en/
IWNIRZ (Poland), https://www.polishhempprogram.com