Generally speaking, teachers' works will involve copyright, such as original teaching plans, courseware, papers and so on. It may also include some books and papers written in education and teaching. If there is infringement, it is generally distributed and downloaded by publishing houses and websites without permission.
For example, Huanggang Middle School in Hubei Province has produced a set of simulation questions for the senior high school entrance examination, which is copyrighted. If others publish without permission, their copyright will be infringed. However, if the teacher copies the students without charging any fees other than printing, that is, it is only used for teaching and not for profit, then it does not infringe copyright. If it is profitable, it will infringe copyright.
Copyright means that once a work is created, it has copyright, but if you claim rights, you need evidence to prove that you created it yourself. Copyright can be registered if periodicals, newspapers, publications, etc. They are all published under their signatures, and they can also prove that they are original.
It is not easy for teachers to completely protect copyright, because your courseware and lesson plans are easy to flow out, and the content of the lecture is in accordance with the outline, which is not much different from other teachers.
Another problem that makes it difficult for teachers to protect their copyright is that teachers are individuals, so it is difficult for you to leave your job to do rights protection.
Now there are more videos and audio in the lectures, such as the training class in New Oriental. Many videos and audio circulating on the Internet are recorded by students and posted on the Internet, which infringes the copyright, but it is difficult to investigate.