upload Document to SP Document library through MS Word

Question

upload Document to SP Document library through MS Word,  how to restrict this operation to particular SP group users.

 

Eg: Group A users only can do this, Group B & Group C  should not

 

 

reference:

 

http://sharepoint.stackexchange.com/questions/85399/office-2013-save-to-sharepoint-team-site-instead-of-my-site/204530#204530

 

 

thanks