Apology Letter For Copyright Infringement
Dear {Recipient},
I'm very sorry I used your {original work} in {violating material} without your permission. It was really
irresponsible of me to not check first if it was subject to copyright.
Please know that I am willing to go about this the right way. I am prepared to purchase a license from you or {take the material down/stop production/something else}. Kindly let me know your preference.
Again, I'm sorry for the trouble I've caused.
Sincerely,
{Your Name}