Online sale of software product use licenses through a data network by offering software products (SOFT) through vendor sites, purchasing a license on-line on one of said vendor sites, and activating said license on-line by a different licensing site. A specific component (COMP) is provided with the software product (SOFT) and identifying data (IDV) of the vendor site are transmitted during the download of the software product (SOFT). When the component (COMP) is executed in an equipment, the component (COMP) locally accesses said data (IDV) and identifying data (IDL) of the licensing site and activates the license by setting up an on-line communication with the licensing site.