the restrictions on the sale of an item depend on the type of item that is being sold and any residual rights that you may retain over that item. as far as i can tell there is no way to analogize between racially restrictive covenants in real estate contracts and the rights to assert certain ip rights over a product that is already sold on its way to downstream consumers.

when you come across a problem that involves this type of intellectual property issue, ask yourself which type(s) of intellectual property are in question (copyrights, patent, trademark etc).

Then, try to figure out what rights an owner of that type of intellectual property has over the item.

Also, you'll have to think about which country's laws apply also because copyright owners' rights are very different in diff countries, ie France vs. the US.

That's a rough type of analysis that you can do to get a feel for the issue.