You may or may not be able to breed with a patented variety, depending on the type of patent and the license offered by the patent holder. A standard utility patent on a variety forbids breeding with it. A utility patent on a trait may forbid recreation of that trait even from other genetic sources, although that is not something that we generally consider. You can breed from a PVP, unless what you breed from it is "essentially derived," which is generally considered to include sports. And systems outside of US law vary in their details. Also, varieties are increasingly bag-tagged or come with a separate contract that can specify almost any restriction that is valid under contract law.
So, we have to take some care in evaluating new varieties. Overall though, the more common problem is that people submit varieties that don't involve a clear case of breeding. For example, growing a variety for multiple generations for local adaptation without ever intentionally crossing it. When there was an intentional cross and the phenotypic change is evident, it is a lot easier to make the case for breeding than when the phenotypic change is small and likely within the normal range of expression for a given variety.
Increasingly, people are breeding from OSSI pledged varieties, which makes all the progeny automatically OSSI pledged. That may be the bazaar that you are looking for, Nicollas.