Abstract: A system for securely transferring an electronic package from one user to another includes a mechanism for requiring payment from the recipient of an electronic package before the recipient is permitted to receive the package. The sender of an electronic package may specify one or more files to be included in the package, one or more recipients of the package, and an amount of a required payment. Each recipient is notified of the electronic package and prompted to provide payment. The system permits each recipient to download the electronic package only if that recipient provides the required payment. The sender may specify a different payment amount for each recipient. The sender may add, delete, and modify files within the package over time. When a recipient downloads the package, the files that are within the package at that time are provided to the recipient.