Copy protect in google docs

Here is how to make it hard to copy your document on google docs.

• On Google Drive, control-click the file.
• On the drop down that appears, click "share".
• Put in the person with whom you want to share in "add people and groups"
• Their name will appear under People with Access. Change them from an Editor to a Viewer (this is what I failed to do last night).
• Click the settings wheel in the top right.
• Click off "editors can change permissions..." and "viewers and commentaters can see the option to download...."