title: How secure the protobuf is to get some of the data out?
body: <ol>
  <li><p>Without any encryption, if the recipient has the serialized Protobuf file but does not have the generated Protobuf class (they don't have access to the .proto file that define its structure), is it possible for them to get any data in the Protobuf file from the binary?</p></li>
  <li><p>If they have access to a part of the .proto file (for example, just one related <code>message</code> in the file) can they get a part of that data out from the entire file while skipping other unknown parts?</p></li>
  </ol>