The specific genetic material being put into this modified viruses had to be engineered with markers and such.

As gene therapy moves into the mainstream, the specific DNA/RNA sequence that a given condition requires will be standardized. Best case scenario is that they end up in GenBank for unlimited public use. Worst case scenario is that developers are allowed to register those sequences as proprietary and charge for their use.

Given that, my general cynicism leads me to believe the latter is more likely than the former.