a policy which defines who can perform the action.
Simply put, everything you want to do on a Fabric network is controlled by a
policy.</p>
<p>## Why are policies needed</p>
<p>Policies are one of the things that make Hyperledger Fabric different from other
blockchains like Ethereum or Bitcoin. In those systems, transactions can be
generated and validated by any node in the network. The policies that govern the
network are fixed at any point in time and can only be changed using the same
process that govern