Comment by thombat

The final phase of Symbian OS was becoming the open-source Symbian Foundation. This required the existing codebase, hundreds of thousands of files, to be categorised properly (mostly homegrown, some acquired, some licensed) and where necessary restructured so that each directory only had one kind. Painful, exacting, tedious archaeology which all-but-froze development for weeks. Like a long-deferred merge, the cost to pay for belatedly resolving a mess of licenses is daunting.