[wtracy]

On number two, if the project uses a BSD-style license, it's possible for some corporation to create a proprietary derivative. For projects with GPL-style licenses, the only way to do this is to get all the copyright holders (basically all the contributors) to sign a license agreement giving the corporation the right to create a proprietary derivative. (This occasionally happens with one-man projects, but basically cannot happen with large projects like the Linux kernel.)

In either case, the existing releases will still fall under the FOSS license.

[eduardordm]

Most large projects require the forfeit of all copyrights before you can join the project.

[wtracy]

The only examples I can think of are projects run by the FSF and some corporations (the projects run by Oracle, for example). You can contribute to the Linux kernel, Apache, the BSDs, Ruby, and really most FOSS projects without signing away anything.

[eduardordm]

I stand corrected