There are two types of Licenses - Exclusive (exclusive) and Non-Exclusive (basic and pro).
An exclusive license provides the purchaser the exclusive right to use the vocal track in a new song going forward. This means that the vocal track can no longer be sold to anyone else. Voclio automatically takes down the vocal track when an Exclusive license is sold.
A Non-Exclusive license allows a vocalist to sell the same vocal track to multiple parties and does not gaurantee exclusivity to the buyer.
Please note that we do not guarantee a non-exclusive license hasn't been sold prior to purchasing an exclusive license either on voclio.com or another source. We recommend reaching out to the seller if you would like to verify. In addition to exclusivity, each license has a set of terms and conditions. These terms outline rights given to the buyer. Terms may include things such as streaming limits - which place a limit on the number of streams your song can have before a new license must be purchased, sales limits - which place a limit on the number of sales your song can have before a new license must be purchased, etc.