Editing a level that someone else thought was done is not always a bad thing either. I do still have a few of the levels I got back when JJ2 was young, and there are many of them that have BIG mistakes, or that ought to have music and were never given any. Most of the people who made these levels left the Jazz 'scene' long ago. It's easier to just fix them than to track someone else down, explain to them what's wrong, convince them they should care, and then find out that they forgot their own password anyway.

I wouldn't put any of these back out claiming they were mine, and I don't think most of the people on this board would either.

Edit: Another thought... J2O is now the biggest repository of Jazz levels online to my knowledge. Chances are that any "hijacked" levels would be posted here, or nobody is going to find them anyway. Assuming someone tries to post them here, more than likely, somebody is going to notice it and say something. SOMEONE is bound to have seen the level before, and if not... where on green earth would it have come from, and is it likely that a level of any worth is going to be totally unknown by now? IF, and it's a really BIG if, a level gets hijacked, it's going to be caught immediately, or it's going to be a rather poor level.

I think it's pretty clear that the benefits of eschewing passwords outweigh the risks.