Just ask. Contact the copyright holder in writing; many rightsholders have online forms to simplify the process.
Contact the copyright holder, typically in writing, and specifically explain your intended use.
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, you cannot legally copy a small portion of copyrighted material for commercial use without obtaining proper permission or a license from the copyright holder. Copyright law protects the exclusive rights of the copyright owner and using someone else's work without permission can result in legal consequences for copyright infringement.
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.
Usually, your agreement with the copyright holder will specify a notification (such as "used by permission") which must appear on or with the work.