Seeking input from developers: glibc copyright assignment policy.

[Paul Eggert]

On 6/14/21 8:18 PM, DJ Delorie via Libc-alpha wrote:
> The DCO means we will never change the version
> of GPL we use

If the DCO really means that then it could be trouble, as copyright law 
mutates and the LGPL clause that lets you redistribute under later 
versions is an important escape hatch to deal with future changes to 
copyright law.

But I don't understand why the DCO really means that; could you explain?