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What is the general concept of an operad automorphism$?$ Is there a "standard" definition?

[added after comment] If an operad automorphism is an invertible operad endomorphism, how then is operad endomorphism defined?

I'm being drawn into these ideas for a section of a paper I'm workign on and most likely this is written-up nicely somewhere,so

references would be most welcome.

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2 added 170 characters in body; edited title

What is the correct definition general concept of an operad automorphism$?$ Is there a "standard" definition?