[acdha]

We have considerably more than 4, some of which are custom works of companies which have been selling under their terms since the 80s. No, I don’t think it’s a huge problem but if you have a lawyer who doesn’t at least want to check, you need a better lawyer.

[account42]

This is actually something that a law requiring source code releases would end up improving though as those companies would be forced to standardize their licenses or find themselves without customers.