Custody of an asset is already common knowledge within the financial market, although sometimes confused with the concept of custody, we have seen more and more assets that have their custody well-directed in institutions with a great tradition in the market.
A clearer explanation of custody concepts is here. In its custody, it is nothing more than the custody of an asset, where it is maintained and updated by third parties, on behalf of the holder, often taking into account documented issues of SKR, which attests to the existence of what is is saving.
There is no better explanation for such a term than the understanding that an intuition, duly accredited, is responsible (always after a compliance) to guard, protect and, in some cases, depending on the contract established between the parties, update and maintain such assets on behalf of their owners.