When does a hybird become a pure breed?

when the chicken becomes a hybrid it cannot become a pure breed (thats what i think but someone might prove me wrong)
 
Well thats what I thought, but someone today was telling me that the CLB started off as a Hybrid, but now is considered a pure breed in its own right.
 
All pure breeds were originally hybrids derived from the original wild Jungle Fowl of which there are two types I believe. Different strains of bird were bred and selected for desired traits and by continous reselection the lines are "straitened" until all offspring come true to type. Therefore after a number of generations of breeding pure within a cross a new pure breed can be established.
Just consider the mediteranean light breeds, Leghorns, Minorcas, Anconas etc they were all established in geographical regions by being bred continously in that region without importing fresh genes from other regions.
I think 7 generations of being bred pure without an outcross establises the breed, but it still has to be recognised as a breed.
At least that's how I understand it.
 

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