If you're looking for a free solution, BurnAware offers a free version called BurnAware Free. The free version provides basic disc burning capabilities and is suitable for casual users. However, if you need advanced features such as multisession disc support, bootable discs, and detailed disc analysis, upgrading to BurnAware Professional is necessary.

BurnAware Professional is a powerful and feature-rich disc burning software that offers advanced features for burning CDs, DVDs, and Blu-ray discs. It's designed for both home users and professionals who need a reliable tool for their disc burning needs.

I understand you're looking for information on how to obtain a free working license key for BurnAware Professional. However, I must clarify that using or distributing copyrighted software without a valid license is against the law and can lead to severe legal consequences.