Or at least restrict it to only those with sufficiently deep pockets?

There are some factors to consider: First, a band has to have a sufficiently deep catalog.

Agricultural land drains have to be installed sufficiently deep to avoid plough damage.

The whole network was tied together, in many cases, by dedicated phone links buried sufficiently deep to provide protection against bombing.

I had read somewhere that from a sufficiently deep hole, one could see the stars, if the day were clear.

The drop was dangerous; probably not fatal, but sufficiently deep to break an arm or a leg.

He went for the misery sufficiently deep to create a story that makes us laugh...

One dose of the paralysis drug had not placed him into a sufficiently deep coma, but three would probably kill him.

"But we feel we're building enough firewalls inside the organization that will be sufficiently deep to make sure the problems don't happen again."

The energy trading market is sufficiently deep that it survived the collapse of Enron with hardly a price ripple.