But you don't use the past tense of a verb to modify a noun. You use the past perfect, such as "a frozen lake" - not "a froze lake." "A written summary", not a "wrote summary." You would say, "A wounded animal" because there is no 'en of "wound;" "wounden" is not a word.
Sometimes the past tense and the past participle are the same, but not always.
If the word were "copywrite" the past participle would be "copywritten."
But that is if the verb were "copywrite," It isn't. The verb is copyright. The past perfect is "copyrighted."
The phrase you are looking for is "copyrighted images."
I learned that reading from the bookshelf of grownup books my mother, who never went to college, collected and put in my bedroom. They were books like "Chariots of the Gods," and "I'm OK, You're OK," and "Body Language." They were cheesy pop non-fiction in the seventies, but it was gramatically correct.
That was the "home schooling" that made me learn far more about the English language than my peers ever did. Also critical thinking which has been literally banned in some parts of public school education.