You may use this service freely if copyright in the work to be copied has expired or you own the copyright in the work.
Otherwise, you may use this service if you are a disabled person or you are making an accessible copy for a disabled person. For this purpose, a disabled person is someone who has an impairment that prevents him or her from enjoying a copyright work substantially to the same degree as a person without that impairment, so long as it is not a visual impairment that can be improved merely by the use of corrective lenses. An accessible copy is one that enables a disabled person to use the work as comfortably as a person without the disability.
You may make an accessible copy so long as the disabled person has lawful access to the copyright work that is to be copied. This may be because the disabled person owns a copy, has a licence to use the copy or has access through a library or educational establishment that has a licence.
The accessible copy must be solely for the use of the disabled person and may not be passed on to anyone else. It may not include any changes to the source work that are not required to deal with the disabled personís disability.