The rules changed last year regarding license and invitations. I applied for mine last year without either and it came through approved. I crossed the border from Ontario into Michigan and NY without any problem. I usually took the program for the shoot with me, but was never asked for any additional information. I ran into one US border person that was unfamiliar with the paperwork, but she was helped out right away by another officer. I was not sent into secondary for an inspection this year, either.