title: How to encrypt a .zip file?
body: <p>Is it possible to encrypt a Zip file? I know encryption is used to make .txt files unreadable until decrypted with a key. Although I want to do the same with a .zip file.<br>
  I have multiple files I want users to download from the internet through my program I'm creating, so I thought I'll compress them files in a .zip and then encrypt the Zip for added security. (I don't want users to access the file within the .zip without a serial code)<br>
  I was going to keep the 'serial key' in a database online which the program would get.    </p>
  
  <p>Am going about this in the wrong way?  </p>