All the public designs and templates available on PixTeller Editor are under the Creative Commons Zero license.
This means that you can copy, modify, distribute and use the designs for free (with PixTeller watermark for free users), including for commercial purposes, without asking for permission from PixTeller. No attribution required to PixTeller or third party services that we use
You absolutely would be safe copyright-wise when you use a PixTeller creation, as long as that creation just contains elements that you searched for from within PixTeller Editor or PixTeller templates.
As soon as you use a public design, import or upload a photo / graphic elements / logo / icon / etc from elsewhere please double check the copyright licence.