GPL (and other share-and-share-alike licences) gives freedom to the software.
BSD (and other attribution or public domain licences) gives freedom to the developer.
Both give similar freedom to the users. In fact, they establish no restrictions on users or usage.
With BSD (and other attribution licenses) it depends on the developer's goodwill whether the user can get the source code or not.
GPL allows nearly frictionless transition
Absolutely, which is why I used the term of 'giving freedom to the code' - in perpetuity.
> With BSD (and other attribution licenses) it depends on the developer's goodwill whether the user can get the source code or not.
Concur, which again, is why I used the term of 'giving freedom to the developer' - to do with the code what she/he wants.