if the Owner or any Campaign manager who Use the designs will Be accused by Copyright Act and Stealing other's stuff..
Reason: Signatures Designed by Jayce who usually charge 0.1BTC. but He was agreed to make designs for 0.05BTC to give me discount because of our Friendship and Business Relation.. but Since I am out of This Project. I want owner to Pay the Remaining amount of 0.05BTC to Jayce before using the Codes for any kind of Activity.
The only one who can claim copyrights is Jayce himself, as he designed them, not you. And if he agreed to do it for CGC (for whatever amount) and if CGC paid him, then they have every right to use them.
That being said, if you feel that they dismissed you unfairly, you should demand a payment for any kind of work you've done for them before being fired.