llections can now
optionally be defined with an endorsement policy that overrides the
chaincode-level endorsement policy for keys within the collection. This
feature can be used to restrict which organizations can write data to a
collection, and is what enables the new chaincode lifecycle and chaincode
application patterns mentioned earlier. For example, you may have a chaincode
endorsement policy that requires a majority of organizations to endorse,
but for any given transaction, you may need two transacti