There is a lot a debate about these questions at the moment, it would be cool to get some guidelines / good practises about these practises.
I've been uploading lots of stuff :
1-some profiles I did by myself - 100% owner
2-some rigs from my own profiles with other's CABs or other CAB I did by myself - 50% owner
3-some rigs with other's AMPs and with my own CABs ( lots of this type actually and those are amongst the best : see BB KING's Lucille for instance ) - 50% owner
4-some rigs with other's AMP & CABS but with heavy mods resulting in a VERY different rig - See trainwreck clone LP by Joptunes for instance ( appears under joptunes nameon the RIg Ex ) - 0% owner - Once again this is killer stuff I cannot keep for myself since they are so good.
When I upload I try to keep track of the original profiler's name AND a short notice (tweaked by waraba) but I'm not 100% liable during the tagging
In some cases I did upload some rigs I don't own under MY name - these rigs are clearly not mine , but they are a very good contribution to the community effort - I will never upload something I don't like or use myself ( except in the case I'm in a conservative mood )
Its a bit strange to upload someone else's rigs under his name ( like the one from joptunes I did ) that's why I did add 'LP mod by wara' in the tags, but it appears under his name on the Rig Ex.
I think we got to keep this tolerance to uploading other's people work , BUT : Keep track of the original profiler AND add some tags about the mods / tweaks added with the modder's name.
my 2 cts on this question ...