I've noticed that now and then there are those who've somehow purchased or been given an Amiga, but doesn't have the WB-disks with which it was originally shipped. The discussions has often involved where to get these (i.e. purchase) in order not to violate the licensing rights of whatever company that's holding those these days.
My interpretation, however, is that if you own the Amiga hardware, whatever way you've acquired it (apart from theft), you also hold the license for personal use of WB, and therefore you're fully entitled to download or copy Workbench for use on that particular Amiga. Emulators such as WinUAE is of course another discussion entirely.
I'm posting this because I don't consider it fair that those trying hard to be law abiding Amiga-users should pay for something they one way or another already have payed for. Particulary since there probably aren't too many that qualify in that category after all..