He is from Holland and there all of this is legal, in my opinion they can't touch him... Whole responsibility is on buyer(depends on his country laws), Am I right?
Sounds right to me

Although sometimes customs likes to snag a few packages. Most of the big time seed distributors have a pretty streamlined system where they are able to 're-ship' products with a slightly different method of 'stealth' employed. Never heard of anyone gettting popped for seeds though as they are technically a novelty item until planted/growing.
That is at least my understanding of the USA's stance on all that jazz. Someone please correct me as I don't want to give someone false confidence (I could be a pot smoking monkey for all you know)
Edit: I remembered seeing a thread over in the goods section. Guy sending lots of stuff from Europe for bitcoin. Mostly focuses on Vapes, Grinders, Pipes, and Seeds.
https://bitcointalk.org/index.php?topic=265229.0