[Five]

the Zeppelin BBC sessions are heavily edited in the official release, that's why you'll see some of those sessions allowed here. sources that mine the official release for some of its content are right out of the question.

if you have an fm broadcast where some small portion is released (maybe as a cd single b-side) you can seed the complete broadcast here so long as you do not mine the official release where the overlap is concerned. If there is too much almost-exact overlap, it is required to remove the overlap and just seed the 'bonus tracks'.

to answer your question, I have a tape of Saga broadcast in europe that is a crappy-sounding version of the live album 'in transit' with no differences other than sound quality. That I would never seed here.

If you give some examples of what you want to share, we can answer your question in more detail...