One of the issues that causes traditional univesities grief is that once you include an OER into a course than the course must conform to the Creative Commons licence of the original OER. Therefore if TRU even re-purposes the content they must make it available (without restrictions) for others to download. Otherwise the institution violates the licencing agreement.
Now that being said, I am not sure who enforces this policy. It would be a very difficult task to follow the different re-use/re-mix variations that are based on single OER.