This is borrowed from the Official CBCS Signature Programs page on Facebook. While it will be kept up to date as best as possible, everyone is encouraged to visit the page and check the pinned post for updates.

Quote:
Originally Posted by Mark Roman
Latest Updated List of Signature restrictions: AWs CANNOT self-witness ROBERT KIRKMAN, TODD MCFARLANE, J. SCOTT CAMPBELL (only through CBCS scheduled & private signings or AWs obtaining a multi-event form that involves Art Rep. Brett Cate), STAN LEE (only thru Excelsior Collectibles via CBCS [stop at the CBCS booth for a submission form and then stand in line for Stan Lee to sign your book(s) & immediately proceed to Excelsior Collectibles, to drop off your book(s) with a $20 cash handling fee] or mail/send books to facilitators: Steve McDonald, Jeff Avigliano, Genuine COA & Trinity Comics for private signings), JIM LEE (only thru CBCS & any Non-DC/Marvel booth signings), JIM STARLIN (only thru CBCS or an AW working the CBCS booth) & ROB LIEFELD (only thru CBCS private signings [list of approved Facilitators coming soon]).
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*** Scott Snyder, Tom King, Jock, Steve Orlando, Joshua Williamson, Marguerite Bennett, James Tynion IV, Donny Cates & Greg Capullo can only qualify for yellow label (ASP) if the AW has a CBCS form, to have handler/rep. Doug Peters sign or thru a CBCS private signing, which will show proof that you paid for the signature that will ultimately be certified under the ASP. ***
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* Some of the artists/writers will have a ticketing process OR initials on the CBCS submission forms by the art rep./managers, to qualify for CBCS yellow label (ASP) ONLY. LARRY LIEBER, JOE GIELLA, JOHN ROMITA JR. & TONY MOORE will work this way, by comic book creator's handlers (Desert Wind Comics, Jeff Harnett & Mr. & Mrs. Tony Moore). Tickets that are not given to CBCS or no initials on the CBCS submission forms by the art reps or managers, will not qualify as ASP & will be given the option for a red label (VSP).*
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*** The following "AT-HOME" signings are approved by the following creators & art reps. thru CBCS facilitators Genuine COA: John Romita Sr, Sal Buscema, Joe Giella, Don Perlin, Gerry Conway, Michael Kaluta, John Romita Jr. & David Michelinie. ***
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******* Melbourne Toy & Comic Con, as well as Orlando Toy & Comics Con, are off-limits to witness for CBCS & CBCS AWs. *******
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** ALL signatures qualify for the VSP (red label). **CBCS announced private signings could simply be dropped off at the CBCS booth of that particular convention the comic book creators will be signing at.**


Updated 11-07-2017

Official CBCS Signature Programs Facebook page