The question becomes who owns the works and what rights does the owner has over the works.
By definition an author is someone who contributes copyrightable expression to the work.
The owner of a copyright has the exclusive right to reproduce work, to distribute copies, to display work publicly.
Music, artwork, software, poetry.
Logos, ideas, phrases, works created by federal government.
ideas, images, sounds, discoveries, facts, texts that is unprotected by intellectual property rights and free for all to use or build upon.
Orphan works are commercially unavailable and the copyright owner can not be found.
Copyright governs the use of materials you might find on the internet.
People assume that everything posted on the internet is public domain. Whenever an author posts anything on the Internet, he or she should reasonably expect that it will be read, downloaded, printed out, forwarded, and even used as the basis for other works to some degree. So, just by posting, an author impliedly grants a limited license to use her work in this manner
Where fair use may be questioned, implied rights may be broader, but an express right to use it best it is clear and reassuring. It is possible today to search creative commons licensed works by license type.
In the copyright act section 110(1) the law allows the teacher to fair use, display, performs and play other’s works in the classroom.
Requirements: Institution must be accredited, non profit educational institutionThe user must be part of mediated instructional activitiesThe user must have specific number of students enrolledThe user must be either for live or asynchronous class sessionsOnly reasonable and limited portions