There are two different kinds of ARM licence
The majority of companies that use an ARM processor take an off-the-shelf ARM design, combine it with components from ARM or 3rd parties to form their SoC and hand the results to a fab company (TSMC, Samsung etc) to build. A small number of companies (Apple, Qualcomm and nVidia for example) have Architecture licences, which allows them to come up with their own CPU designs that execute ARM code. The resulting designs can be faster and/or more power efficient than the stock ARM cores.
The silicon design company (PA RISC IIRC) was bought many years ago, well before the first of their internal ARM designs. The designers may be pre Apple, but their work has all been done on Apple's time.