Ilan Garibi said among other things ... "law, as well as customs that spread in a community should make sense, and be of use. "
One other issue that should be factored in is practicality. Two points have been raised in the recent discussions: one is respecting the creator's efforts, and the other (not loudly mentioned) is financial. The first issue can be addressed by making sure that the model is correctly attributed to the creator. I am often at a loss how to reach the creator, so a simpler and more practical approach would facilitate sharing of origami. As regards payment, again I would advocate a more practical approach. If I am folding someone's work for an advertising campaign, then I should ask for permission and pay the creator. But if I am receiving a few tens or even hundreds of dollars, tracking down and paying the creator her share is quite daunting. As a practical measure, I suggest that creators who want permission to be sought include in their books how they can be contacted. This would avoid the need for people to write to the Origami list for information on how to contact a certain creator, as we see every now and then. Tiong Boon