Thanks BananaMan from our BPN Forum
There appears to be stronge evidence of this soon-to-come paid version of KaZaA, dubbed "KaZaA Plus". Hidden in the KaZaA v2.0 executable are many instances of "plus" features which might very possibly be related to a subscription-based service that Sharman, along with Altnet, is planning to initiate in the near future. Another explanation could be that Sharman Networks will release a separate, more advanced "plus" upgrade version of KaZaA.