Under what condition can copying long works and picture books occur?

The correct answer is that only two pages can be copied. This guideline reflects the fair use doctrine in copyright law, which allows for limited reproduction of copyrighted works for educational purposes. When it comes to copying materials, particularly for educational contexts, there is a specific emphasis on ensuring that the use falls within certain reasonable limits to avoid copyright infringement.

Copying only two pages of a work is a conservative approach that aligns with the notion of fair use, which seeks to balance the rights of creators with the needs of educators and students. This limit is designed to ensure that the integrity of the original work is maintained while still providing a means for teachers and students to utilize necessary materials in a classroom setting.

The other conditions mentioned are not established guidelines and may lead to potential copyright violations or misuse of copyrighted materials. For instance, copying 50% of a work or any unrestricted amount could easily be seen as infringing on the author's rights, while the notion of copying up to 100 pages does not take into account the potential impact on the market for the original work. Therefore, understanding and adhering to this specific limit of two pages is crucial for educators when planning their instructional materials.