Nokia confirms Symbian no longer open source

“Nokia has confirmed that it has closed the source code for the
Symbian smartphone operating system. It says that despite it
describing its new model for Symbian smartphone operating system
development as ‘open and direct’ the ‘open’ part did not refer to
‘open source’ but to being ‘open for business’. The “open and
direct” model is designed, according to Nokia, to “enable us to
continue working with the remaining Japanese OEMs and the
relatively small community of platform development collaborators we
are already working with’.”

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