To be clear, understand that the Digital Millennium Copyright Act Makes it illegal for anyone to make and distribute copies of copyrighted works, audio, visual, and print. Therefore, this is not a service we can provide.
However, it has been held that you, if you are the owner of the work (VCR tape, Audio Cassette Tape, etc), can legally make a digital backup copy for your own use. We can assist you in this process.
In addition, you may use a small section of a copyrighted work in your teaching. This might, for example, take the form of a 8 minute segment of a movie, inserted into a Powerpoint slide. We can help you "pull out" these portions of a larger work to use for your teaching.
Audio Cassette Player/Recorder