I am having trouble understanding Section 9 of the GPL v3 license:
9. Acceptance Not Required for Having Copies.
You are not required to accept this License in order to receive or run a copy of the Program. Ancillary propagation of a covered work occurring solely as a consequence of using peer-to-peer transmission to receive a copy likewise does not require acceptance. However, nothing other than this License grants you permission to propagate or modify any covered work. These actions infringe copyright if you do not accept this License. Therefore, by modifying or propagating a covered work, you indicate your acceptance of this License to do so.
As far as I can understand, I'm allowed to give copies of my GPL licensed work if I directly provide it to a peer, or a friend as mine. It seems that the license doesn't apply if they modify it, but it doesn't look like if it applies if they link or something. Can someone tell me what this clause in the license means?