There is an issue about buying rights.
If someone acquires a copyright, this does not necessarily imply that someone else looses it, i.e., that there is only one holder of a Right of type "copyright". If this is the case, my copyright and your copyright on the same text is two different instances.
In this sense, it is not "sold", but I can be paid for resigning from my right and granting you a right.
The question is, if the CRM should deal in such detail with rights and business, or if this would be a compatible extension. In particular, we have no model for exchange businesses of any kind, this was not in the practical scope. But, of course, this is very interesting!
If a model is found, put into CRM specializations list (Issue 161).
Crete 18/5/2011