I had contacted upstream regarding PublicDomain license for Haskell
package MonadCatchIO-mtl  as mentioned at:
The response is as follows:
=== REPLY ===
If I recall correctly, this package was built from gathering code
snippets that were posted by others on public mailing lists. Hence, I
consider it to be in the public domain and don't want to claim any
form of copyright on it (not even the claiming-and-releasing that, if
I understand correctly, the CC-0 license does).
If I understand correctly, if I don't claim to be the copyright
holder, I cannot provide you with a useful statement. Of course, I'm
not a lawyer and I don't have much experience with licensing issues,
so I'm open to more knowledgable advice.
=== END ===
Please let me know as to how we can proceed further?
Appreciate any inputs,
 HackageDB. MonadCatchIO-mtl.