Published at LXer:

"What is going on whenever someone changes a code is that they make a'derivative work'," began Theodore Ts'o."whether or not you can even make a derivative work, and under what terms the derivative work can be licensed, is strictly up to the license of the original. For example, the BSD license says:'redistribution and use in source and binary forms, with or without modification, are permitted provided that the following conditions are met....' Note the'with or without modification'. This is what allows people to change BSD licensed code and redistribute said changes." He added,"it is not a relicencing, per se, since the original version of the file is still available under the original copyright; it is only the derived work which is under the more restrictive copyright."

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