When you promote a dataset to Discovery for enrichment, you will be asked to select the type of promotion you wish to run.

A limited listing will only enable another party to view your company information. If they want to understand how your data intersects with theirs, or to learn about the types of keys or categories, they will need to request access. 

Selecting a limited listing is recommended if you want to restrict who can learn from your data.

See also - full listing.