Sharing a question in a physical sense might be a copy-write issue yet people discussing how one might answer a question that could be proposed in an examination I think would not be. Please do not try and outright scare people into isolation for study. Working in study groups is a great idea and should be applauded.
Should you be trying of course to sell something, like a review course book etc, then we would be only to happy to assist. We have made several attempts in the past to contact authors of such texts with little to no correspondence.
Under the UK law the following is totally permitted
Acts that are allowed
Fair dealing is a term used to describe acts which are permitted to a certain degree without infringing the work, these acts are:
- Private and research study purposes.
- Performance, copies or lending for educational purposes.
I am not of course sure if this differs in North America