A lot of vendor packages included source code licenses actually. I'm not sure distributing binaries was even practical in all cases since the code would have to

A lot of vendor packages included source code licenses actually. I'm not sure distributing binaries was even practical in all cases since the code would have to be built with and linked to specific versions of systems libraries and keeping track of which customer is on which system would be a nightmare. I'm familiar with several loan accounting systems and financial authorization systems that are either nowadays totally maintained by the bank or co-developed with the vendor in a shared source model.