Online and face to face classrooms are treated differently by copyright law. However, for both types of classroom setting you can:
What the TEACH Act does not allow:
• Commercial document delivery
• Textbooks or other digital content provided under license from the author, publisher, aggregator or other entity
• Conversion of materials from analog to digital formats, except when the converted material is used solely for authorized transmissions and when a digital version of a work is unavailable or protected by technological measures.
It is also important to note that the TEACH Act does not supersede fair use or existing digital license agreements!