For anyone wondering:

EAW = European Arrest Warrant

EIO = European Investigative Order (basically lets different jurisdictions demand information from each other)

CJEU = Court of Justice of the EU (think of it as a supreme court)

Also IANAL: I Am Not A Lawyer. If you really want to guard yourself from a legal standpoint, write the full sentence. "IANAL" could mean anything.

That being said, I am not a lawyer, I am not a legal professional, this is not a legal advice.