Video capture - is it allowed to do it?

Hi,

I am a teacher at a German school and I love your vokis. They are nothing short of fantastic :)

I have got a questions about the conditions under which I can use them for educational, non-commercial purposes.

I am creating an interactive scorm-packet with Adobe Captivate.
The topic is American and British English.
I would love to include one American and one British Voki - talking to each other about the pictures in the middle (pavement <> sidewalk...).

I cannot use Voki Presenter to do that - I have to use Captivate.
Thanks to your blog I know how to do a screen capture. But am I really allowed to use these videos that way I want to use them? Of course I would give notice of your website and link back to you, but is that enough? I would use them only for non-commercial purposes (I would put the "presentation" under CC-BY-NC-SA).

It would be great if you could clear that up for me.

Best wishes,
Melanie