Blockchain is a method of implementing a decentralized database which can be continually updated but never directly edited by any sole participant or user. It has been successfully and securely used as the foundation of cryptocurrencies such as Bitcoin since their inception.
There are many benefits to be gained from using blockchain to implement DRM protection, including a high level of decentralized security. If user permissions to purchase and access files were stored on and verified by a blockchain digital ledger, they would be able to download and use their files in a more flexible manner.