This paper presents an efficient security protocol for certified e-goods delivery with the following features: (1) ensures strong fairness, (2) ensures non-repudiation of origin and non-repudiation of receipt, (3) allows the receiver of an e-goods to verify, during the protocol execution, that the e-goods he is about to receive is the one he is signing the receipt for, (4) does not require the active involvement of a fully trusted third party, but rather an off-line and transparent semi-trusted third party (STTP) only in cases of unfair behaviour by any party, and (5) provides confidentiality protection for the exchanged items from the STTP.