Testing the claim itself
Every copyright defense begins with the claimant's own case: whether it owns what it is enforcing, and whether what you used was protectable expression that you actually copied rather than an idea, a fact, or something you created on your own. After that come licenses, express or implied, and fair use, which depends heavily on the specific purpose and effect of the use. Claims also have to be brought within a limitation period. Registration timing matters as well, because it can determine whether statutory damages and attorney's fees are available at all, and that often shapes the real value of the claim more than anything else.
What not to do first
Do not ignore the letter, and do not respond in detail before reviewing it with counsel, since early admissions are hard to walk back. If a lawsuit has been served, the deadline to respond is short and a default judgment can follow if it passes. Take the material down if continued use would increase exposure, but preserve copies, dates of first use, and records of where you obtained it, including licenses, stock-site receipts, and messages with designers or developers. If an employee or contractor created the material, collect their agreements. Some business insurance policies respond to certain advertising-related copyright claims, so notify your carrier promptly.
Weighing the response
Some claims are well founded and the sensible move is a fair resolution; others are aimed at collecting quick payments regardless of merit. We look at the claimant's ownership, the registration record, the use itself, and the realistic damages before recommending a course. Options include a negotiated license fee, a refusal backed by documentation, or a full defense in federal court, which hears copyright infringement suits. Fee-shifting can work in both directions, which affects how hard each side presses. Bring the letter or complaint, the material at issue, and everything showing how it came into your hands.
