Del. Code tit. 10, § 4325

If a reporter waives the privilege provided by this subchapter with respect to certain facts, he or she may be cross-examined on the testimony or other evidence he or she gives concerning those facts but not on other facts with respect to which the reporter claims the privilege. A reporter does not waive or forfeit the privilege by disclosing all or any part of the information protected by the privilege to any other person.