License ?

Hello mr. ihsan,

I've been searching for free as in free software implementation of the nback game for android.
Yours is the best so far.
I'd like to improve it and ultimately publish it on fdroid.org.
I couldn't find any licensing infos about this code, would you be willing to release it as free software ?
I'm proposing a permissive BSD license, but I'm fine with GPL too.

Regards,
xantares