Limited unlicensed use is described in the "fair use" or "fair dealing" clauses of copyright laws. In the US, for example, it is section 107 of the law. It states that uses "such as criticism, comment, news reporting, teaching, scholarship, or research" may not be infringing if the use also satisfies the so-called "four factors:" the purpose of the use, the nature of the work, the extent of the use, and the effect of the use on the value of the work.
Stanford University hosts a well-respected website dedicated to fair use, at the link below.
If it is copyrighted and you are using more than a brief excerpt in a work of your own, that is to be published or used for profit.
When you have permission of the copyright owner. When the use of the copyrighted work is "fair use" which generally means a small part of the work and not a critical part.
When your use is not exempted in the law.
With permission from the rightsholder, yes.
The publisher or the author's estate should be able to license the materials.
If your use is not covered by a limitation, defense, or exception in the law, ask the copyright holder for permission.
It depends on the type of materials and the extent of the use. There is excellent discussion of copyright for students at the link below.
You can use copyrighted material at any time if you have obtained permission first. In order to use copyrighted materials without permission you need to establish the project as "fair use"The four primary factors you need to consider are...the purpose and character of the use, including whether such use is of a commercial nature or is for nonprofit educational purposes;the nature of the copyrighted work;the amount and substantiality of the portion used in relation to the copyrighted work as a whole; andthe effect of the use upon the potential market for or value of the copyrighted work.
You have to get permission from the copyright owner.
No, copyrighted music cannot be used in your movie without permission, especially if it is to be published. You should always get permission from the respective copyright owners if you want to use content you do not own.
You don't need permission from the company to do "Let's Play" videos. In most cases, the use of copyrighted materials would be acceptable under the fair use exceptions.
If you plan to use someone else's copyrighted work in your own work, such as using a section of a book or a piece of artwork, you should seek copyright permission. If you plan to reproduce and distribute someone else's copyrighted work, such as publishing it or making copies to sell, you should seek copyright permission. If your use of someone else's copyrighted work falls outside of fair use guidelines, which include factors such as the purpose and character of your use, the nature of the copyrighted work, the amount and substantiality of the portion used, and the effect of your use on the potential market for the copyrighted work, you should seek copyright permission.
nothing really unless you have permission to use it
"Fair use" applies to anyone who wishes to use copyrighted material for purposes of criticism, review, news reporting, or scholarship & does not want, for whatever reason, to seek permission from the copyright holder.
You may use another entity's copyrighted materials if you have their permission, or an exemption in the law. The exemptions provided in law vary from country to country.