Hi all. Just had a reply on that as I have the same problem:
Dear Brian,
Thank you for contacting CyberLink Technical Support.
I understand your concern related with CyberLink PowerDirector 9 and you want to know how you can activate the trial version to a full version by entering the activation key.
In regards to your issue, I would like to inform you that once your trial version gets expire, then, it will automatically ask you for the activation key while launching trial software. Then, you can enter the CD key for it.
Please feel free to contact us back for any further clarification or for any assistance related to CyberLink products.
Thanks and Regards
Bedi
CyberLink Technical Support
Hope this helps
Bri