In article ,
Iain Churches wrote:
IIRC, Philips only licensed the use of their format if their specification
was adhered to. Anything else would be a nonsense.

Dobly B was not a part of the spec.

The C cassette was launched in 1963 and
Dolby B was first demonstrated five years later

The Compact Cassette was introduced as a mono format for dictation
machines, etc. Philips were sensible enough to allow it to be used under
license but free of charge. But did retain a degree of control over the
basics.

I'm not sure if this included the use of Dolby B or not. But did over the
basics like speed.

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