Read the license section in http://www.minecraftforum.net/topic...ft-trees-bees-and-more-1700-updated-03012013/ for private (closed) server packs.
The other thread refers to public packs only. I have clarified that.
Thank you for the clarification, I'll be honest, I found Forestry because of the Buildcraft forums That information might best have a home on the Forestry Wiki, but that is also my opinion.