Serum free trial

Stupid question, but is Serum a 15 minute per session trial or literally 15 mins and then you can't use it any more?

15 minutes per use, you simply need to re-instantiate it.

I have a 3 day serum trial on another computer of mine and i was wondering if its possible to transfer de 3 day trial on another computer ?

Yes, just install the splice client app and sign in.