if it were true that indeed was legal to rewrite and relicense open source code, would that also be true for non-open source code? as in, could someone do a similar rewrite of their employers proprietary code and release it publicly?
Yes. Provided you had access to the original source code. Pheonix technologies did this with the IBM bios.
Yes. Provided you had access to the original source code. Pheonix technologies did this with the IBM bios.