How do I restrict a user to copy from a shared folder?

Option is under user Configuration \ Policies \ Administrative Templates \ Windows Components \ File Explorer - Prevent access to drives from my computer.

you can choose to lock out any combination of drives you wish.

The useful thing is, any programs that use the C: drive can still be access and will still save themselves, but it should prevent your users copy/pasting to the C: drive.

Want to get more out of Google Drive for work or school? Sign up for a Google Workspace trial at no charge. 

After you share a file, you can stop sharing at any time. You can also control if people that you've shared with can change or share your file.

Stop sharing a file

Important:

• If you share a file with people, the owner and anyone with edit access can change sharing permissions and share the file.
• If you don't want anyone to publicly access your file, stop publishing the file.

1. Find the file or folder in Google Drive, Google Docs, Google Sheets or Google Slides.
2. Open or select the file or folder.
3. Click Share or Share 
   
   .
4. Find the person that you want to stop sharing with.
5. To the right of their name, click the Down arrow 
   
   
    Remove.
6. To save changes, click Save.

When you change an item's general access to 'Restricted', only people with access can open the file.

1. Find the file or folder in Google Drive, Google Docs, Google Sheets or Google Slides.
2. Open or select the file or folder.
3. Click Share or Share 
   
    
   
    Get link.
4. Under 'General access',  click the Down arrow
   
   .
5. Select Restricted.
6. Click Done.

If you delete a shared file that you own:

• People that can view, comment or edit can make a copy of the file until you permanently delete it.
• To permanently delete the file, click on the file in your bin, and then select Delete forever
  
  . Learn more about deleting files.

If you delete a shared file that you don’t own:

• The file will be removed from your Drive, but other collaborators can still access it.
• To get the file back, open a link to the file 
  
   File
  
  Add to My Drive.

Limit how your files are shared

People with edit access to your files can:

• Share the file with others.
• Add or remove people from the file.
• Change access permissions to the file.
• Copy, print or download the file.

Important: You can't apply this setting to a folder, but you can apply it to individual files in the folder.

To prevent viewers and commenters from printing, copying or downloading your file:

1. Find the file or folder in Google Drive, Google Docs, Google Sheets or Google Slides.
2. Select one or more files that you want to limit.
3. Click Share or Share 
   
   .
4. At the top, click Settings 
   
   .
5. Untick Viewers and commenters can see the option to download, print and copy.

Important: You can limit how people share, print, download and copy within Google Drive, Docs, Sheets and Slides, but you can't stop how others share the file content in other ways.

If you're sharing a file, the owner and anyone with editor access can change the permissions and share the file. To prevent others from sharing your file:

1. Open the file in Google Drive, Google Docs, Google Sheets or Google Slides.
2. Click Share or Share 
   
   .
3. At the top, click Settings 
   
   .
4. Untick Editors can change permissions and share.

Important: If you prevent sharing of a folder, it only applies to the folder. To prevent sharing the files inside, you have to change this setting for the files inside.

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