Contact them in writing and inform them of the infringement, and suggest solutions (remove/destroy the infringing material, agree on a fee, etc). If you are not satisfied with the results, contact a copyright lawyer for help. Actually taking them to court should only be a last resort.
It requires permission from the copyright holder or an exemption in the law.
Yes, it is illegal to use someone else's picture on social media without their permission, as it violates their right to privacy and can also infringe on their copyright.
Libel, slander, and anything that violates copyright laws.
A person or company who violates copyright can be sued by the copyright holder.
You can't. It violates copyright laws.
What you are seeking to do violates copyright laws.
Yes, pirating movies is illegal as it violates copyright laws.
No, it is not legal to watch pirated movies as it violates copyright laws.
Yes, it is illegal to view pirated content as it violates copyright laws.
Yes, it is illegal to watch a pirated movie as it violates copyright laws.
Yes, it is generally illegal to download YouTube videos without permission from the copyright holder, as it violates YouTube's terms of service and copyright laws.
What you are seeking to do violates copyright law.