Counterfeiting
That actually depends upon what it is that you are using. If you use someone's car without permission, that is called stealing. If you use someone's movie without permission, that is called piracy. If you use someone's body without permission, that is called rape.
A person who enters by force without permission is commonly called a trespasser or an intruder.
When you take a picture of someone without their permission, it is called "unauthorized photography" or "invasion of privacy."
The term for taking pictures without permission is called "unauthorized photography" or "unlawful photography."
Use of protected material without permission or an exemption in the law is called infringement.
Certainly, it is called theft.
stalking
Copying someone else's work without permission is called plagiarism.
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If you are the registered owner than that is called "Theft".
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