Answer ... Each party to litigation must produce documents that are in its possession, power or control and are potentially relevant to an issue in the litigation. Each party is entitled to examine for discovery a single representative of each party that is adverse in interest. Additionally, a party that is accused of infringement is entitled to examine any inventor(s) named in the asserted patent. Lastly, in certain circumstances, the court will grant leave for the examination of a non-party.
Answer ... Yes. Canadian courts apply the principle of proportionality to discovery such that the potential relevance of a document or line of inquiry on an examination is weighed against the effort involved in responding to the request.