As you indicate, in clean-room design the implementation is done by a different team from those who examined the original system and wrote the spec (which is vetted):
> Typically, a clean-room design is done by having someone examine the system to be reimplemented and having this person write a specification. This specification is then reviewed by a lawyer to ensure that no copyrighted material is included. The specification is then implemented by a team with no connection to the original examiners.
