Just ask. Contact the copyright holder in writing; many rightsholders have online forms to simplify the process.
Contact the copyright holder and request permission.
No. Public domain means that the material is available for use by anyone, without copyright restriction.
Ask the copyright holder for permission.
You would be guilty of copyright infringement, a federal crime.
Infringement is the use, without permission, of copyrighted material that does not fall under a "fair use" or other exception to copyright law,
Unless it would fall under "fair use" no it is not "okay" to use copyrighted material without permission
Use only original material, materials in the public domain, or materials for which you have permission from the copyright holder.
You may use copyright protected material when you are the copyright holder, or when you have permission from the rightsholder or an exemption in the law. The most notable exemption is fair use or fair dealing, which allows certain limited unlicensed uses in situations such as education and commentary.
You would need permission from the creator or rightsholder to use any material that is not your own.
No, not without permission, or, you feel confident your usage will qualify as fair use. Fair use usually demands that the use be for non-profit purposes, so commercial use is generally disqualified.
If your use is not covered by a limitation, defense, or exception in the law, you need permission from the copyright holder. Typically permission is requested in writing, and is specific to the immediate need.
To determine if material posted online is copyrighted, look for a copyright symbol (), the word "copyright," or the phrase "all rights reserved." Additionally, check for any statements or disclaimers indicating the material is protected by copyright law. You can also search for the material in copyright databases or contact the creator for permission to use it.