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.
Yes, in certain situations such as scholarship and critique.
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.
There is no predetermined amount of copyrighted material that can be used before an infringement occurs. US Copyright Law sets out criteria that has to be considered before something can be judged to be "fair use" # The purpose and character of the use, including whether such use is of 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 # The effect of the use upon the potential market for, or value of, the copyrighted work
There is no predetermined amount of copyrighted material that is eligible for "fair use" before an infringement occurs.US Copyright Law does set out criteria that has to be considered before something can be judged to be "fair use"# The purpose and character of the use, including whether such use is of 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# The effect of the use upon the potential market for, or value of, the copyrighted work
Because (assumedly) you don't have permission to put the copyrighted material on public display. The "fair use/fair dealing" exception allows you to use a portion of a copyrighted work for purposes of scholarly research, etc but it does not give you carte blanche to use the work in any fashion you choose.
There is no predetermined amount of copyrighted material that can be used without permission before an infringement occurs. US Copyright Law sets out criteria that has to be considered before something can be judged to be "fair use" # The purpose and character of the use, including whether such use is of 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 # The effect of the use upon the potential market for, or value of, the copyrighted work
There is no predetermined amount of copyrighted material that can be used. Each case is judged by the planned use and its purpose.US Copyright Law sets out for criteria that have to be considered before something can be determined to be "fair use"The purpose and character of the use, including whether such use is of commercial nature or is for nonprofit educational purposesThe nature of the copyrighted workThe amount and substantiality of the portion used in relation to the copyrighted work as a wholeThe effect of the use upon the potential market for, or value of, the copyrighted work
There is no predetermined amount of copyrighted material that can be used before it is considered a violation. Each case is judged by the planned use & it's purpose. US Copyright Law sets out criteria that has to be considered before something can be determined to be "fair use" # The purpose and character of the use, including whether such use is of 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 # The effect of the use upon the potential market for, or value of, the copyrighted work
Unfortunately there is no hard and fast rule about this; the law mentions the "amount and subtantiality of the portion," and neither the courts nor the legislation have seen fit to clarify that. Fair use, at the moment, is being judged on whether the excerpt is "appropriate in kind and amount," and whether the use is transformative.
There is a provision in US copyright law that allows the "fair use" of copyrighted material, without permission, for certain purposes (scholarship, criticism, review, etc) However US Copyright Law also sets out criteria that has to be considered before something can be judged to be "fair use" # The purpose and character of the use, including whether such use is of 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 # The effect of the use upon the potential market for, or value of, the copyrighted work
The purpose and character of use, including whether such use is of a commercial nature or is for nonprofit educational purposes,The nature of the copyrighted workThe amount and substantially of the portion used in relation to the copyrighted work as a wholeThe effect of the use upon the potential market for or value of the copyrighted work.
There is no predetermined amount of copyrighted material that can be used before an infringement occurs so yes even a few seconds of a copyrighted work could be problematic. Each "fair use" is established only on a case by case basis. US Copyright Law sets out criteria that has to be considered before something can be judged to be "fair use" # The purpose and character of the use, including whether such use is of 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 # The effect of the use upon the potential market for, or value of, the copyrighted work