The demo version of H.264/AVC Pro in MainConcept Reference is fully functional. It only adds a watermark to the video during playback. To turn MainConcept H,264/AVC Pro into a full version, it is required that the MainConcept Reference base application is installed on your system (not included). Once the order process has been completed, you get an e-mail containing your personal serial number and some information about how to unlock MainConcept H.264/AVC Pro. While ordering the product you have the opportunity to additionally choose the option "CD on demand". This is a backup CD which we can send you for a small charge for production and mail order. Furthermore, you are authorised to obtain all following updates of MainConcept H.264/AVC Pro within version 1.xx free of charge. You only have to download the current version and unlock it with your personal serial number.