In Google Docs you have the option to restrict Downloading, Printing & Copying in the sharing settings.
This is useful if you want users to be able to edit a document but you don't want them creating a copy of the document, or downloading it and printing it. It gives you more control over the documents you send.
In the top right of your Google Doc screen click the light blue 'Share' button.
Click on the settings cog in the top right of the share window.
Untick the box to disable the option for users to download, print or copy the doc.
You can change these settings at any time, just follow the steps above.
For more Google Workspace tips click here!