Who do you get permission from and how do you go about getting it without violating an ICA or two? If the shop is for the same end client, the client is expecting two different shops. If the end client is different, it is your business.
Equal rights for others does not mean fewer rights for you. It's not pie.
"I prefer someone who burns the flag and then wraps themselves up in the Constitution over someone who burns the Constitution and then wraps themselves up in the flag." -Molly Ivins
Never try to teach a pig to sing. It's a waste of your time and it really annoys the pig.