"As it stands, in the US, you need to register a work before you can sue."

My understanding is a little different.  You can sue in either case, it is what you can sue for that is different.

If it is registered, you can sue for damages.  If it is not registered, you can only sue to stop distribution/publication/sales of existing copies, but no monitary damages.

Again, complicated law, so I may be wrong on that one.

 

Bill

 

People that know everything by definition can not learn anything