Google issued an update to its Google Drive, now the users will have full control how share documents are used by others. Now you can disable downloading, printing, and copying of your Google Drive files.
This new feature can be accessed from the advanced sharing menu (see image below)- to open this you just have to open the sharing dialogue from your Google Derive file, and then tap on Advanced in the lower right hand corner. Here you will have the option to enable the disable option to download, print and copy for commenters and viewers.
The files in which you will enable this feature will show you an Export Option Disabled notification in the file and edit menu. As you can see in the below image:
At the moment, the feature is only available for the web version and can be used for any file stored in Google Drive.