Di
If you created the molds yourself, you might want to copyright them as works of art. If you register your copyright, they are protected by Federal law (costs around $30). They might also be pattented, but that is for new and different processes which your molds don't seem to be and it is more expensive.

Either way, you can 'license' someone to use your molds for a specific amount of time or number of reproductions.

You might try to find the "licensing agreement" that is used to license musicals and plays and revise it. Those are available through the Writers Guild and possibly online.

Best of luck. This sounds like a very important expansion of your business.

smile