The TCR open database has open registration which means that 'external' Traditional Cobs (Traditional Cobs that are not registered with TCR but that are registered with another registry) can to be uploaded to the TCR database for TCR pedigree recording purposes.
Because the open TCR database has open registration (which allows 'external' Traditional Cobs to be uploaded to the TCR database for TCR pedigree recording purposes) TCR has open pedigree which means that TCR pedigrees show (as recorded parents, grandparents and great-grandparents) both 'internal' Traditional Cobs (Traditional Cobs that are registered with TCR and that are therefore already uploaded to the TCR database for TCR pedigree recording purposes) and 'external' Traditional Cobs (Traditional Cobs that are registered with another registry and that are also uploaded to the TCR database for TCR pedigree recording purposes).