Only as far as your 'freedom' consists of violating any of the rights which GPL bestows upon end users.
GPL exists to preserve rights for end users, and since one of those rights is that of recieving the source code it is incompatible with proprietary projects. As such you can say that GPL is open source code for open source.
GPL exists to preserve rights for end users, and since one of those rights is that of recieving the source code it is incompatible with proprietary projects. As such you can say that GPL is open source code for open source.