Here's a independent link that gives information on the different registries
Registries
"There are many registries, organizations and 'networks' popping up all over the internet. A good rule of thumb when trying to evaluate the validity and integrity of any organization is to examine their purpose (i.e., mission/goals) and to also investigate their standards and practices, making sure that you VERIFY the information they present.
A breeder whose puppies are registered with any of the following "alternative" registries is not a breeder you want to deal with. Most of these registries were begun in response to the AKC’s Frequently Used Sires Requirement and inspections of large kennels producing more than 7 litters in a year for AKC and 10 litters for UKC. This requirement has resulted in the litters of many puppy mills and backyard breeders being turned down by AKC because the breeders refused to positively identify the father of the litter through a DNA test.
Here are some of the alternative registries, with whom anyone at all can register a dog regardless of its parentage as long as you pay the fee. Many *register* mixed breeds and require no proof of parentage and are promoters of the commercial breeder and puppy reseller (broker to pet stores). Please note that some of the registries have similar or the same initials as the older and well established registries. This can cause confusion for consumers. Don't be fooled.
APRI - AMERICA'S PET REGISTRY INC. Advertises free registration for commercial breeders. Non Profit 'dedicated to the preservation of the professional pet industry', dogs and cats. Founded by retailers of pets (commercial breeders and resellers).
CKC-Continental Kennel Club (do not confuse with Canadian Kennel Club!)
CKC will recognize a cross between any two purebred dogs, and will issue a registration certificate on their offspring. These crosses are not registered as purebred dogs but are registered as the offspring of purebred dogs. CKC accepts no responsibility for any inaccurate, false, or fraudulent information submitted on registration applications. They sponsor no shows or championships. They also give big fee breaks to large kennels registering lots of dogs (such as Puppy Mills). Will register dogs not registered with other recognized registries."
Remember since the AKC has cracked down on puppy mills, the breeders looked elsewhere for some kind of certification and these alternative registries popped up. When researching these alternative clubs don't just look at what the clubs themselves say, or what the breeders and puppy brokers say because both would like to mislead you. Look for independent information, people who will not make money based upon your decision.