If you are a label in the underground I would just go ahead and release it, and I can guarantee you won't be in court because they only look for hits and the chance of money. Admittedly, this could happen, so deal with it by disolving the label if need be, but that is extreme and unlikely to happen. Meanwhile, your name is out there and you will be on your way.
Exactly. Unless you expect major commercial success 'publish and be damned' just stick it out there.
if the big boys comes after you with threats (unlikely unless you have a hit) the worse that can most likely happen is you end up signing over the rigths to them.
And even if they get wind of what you've done and come after you without having had a hit (unlikely where's the profit?), think of the publicity you'd gain anyway and press release opportunities arising from it, so you win that way too!