Provide credit to Author ?

[goble1234]

Hi,

When I buy a standard license, should I credit Author ?

[Manriquedelara]

Would be nice if you do it.

[remoteEcho]

… but it’s not mandatory, but still nice

[tiikeri1]

What do you think, should I credit the author with their name or username? I have contacted the author but haven’t received an answer.