Disable Download and copy option in Document library .

i have  done  this using following link.

 

http://sagapanda.blogspot.in/2014/03/hide-download-copy-option-from-ribbon.html 

 

If already you have done this thing then please let me know the steps plus what is the better way to it . 

Whatever link you provided, i have gone through on that and they have mentioned to add code in master page .

 

 

Actually i don't want to hide . Client requirement is , Download and copy option should be enable for Admin only and other users not able to get the download and copy option .

 

I am using SharePoint Online .  

I am talking about this https://msdn.microsoft.com/en-us/library/cc768565.aspx

 

As its not a good practice but might help

I have Implemented IRM but it's not working , 

 

Same Download and copy option is coming .