vector image on a book-cover: editorial or commercial / credit line

[#1]

Hello Adobe-Community,

We have recently purchased this vector image with an extended license –
https://stock.adobe.com/uk/images/triangle-low-poly-polygon-geometrical-background-with-blue-mountai... – and wish to use it as composite visual on a book-cover.
1. We aren't sure if that kind of application falls under an editorial or a commercial usage?
2. And does the credit line becomes optional, if we modifie the vector image majorly (like change colour, composite forms, extend lines and size)?

Many thanks for your support

[#2]

Hello Adobe-Community,

We have recently purchased this vector image with an extended license –
https://stock.adobe.com/uk/images/triangle-low-poly-polygon-geometrical-background-with-blue-mountai... – and wish to use it as composite visual on a book-cover.
1. We aren't sure if that kind of application falls under an editorial or a commercial usage?
2. And does the credit line becomes optional, if we modifie the vector image majorly (like change colour, composite forms, extend lines and size)?

Many thanks for your support