There are reasons, this isn't particularly compelling [LWN.net]

There are reasons, this isn't particularly compelling

Posted Nov 30, 2007 20:37 UTC (Fri) by kmself (subscriber, #11565)
In reply to: Why a license is better than Public Domain by jreiser
Parent article: qmail released into the public domain

Proof and/or demonstration of authorship is one of the key parts of virtually any copyright dispute. In most cases it's sufficiently trivially accomplished that it's not given much thought. There are significant legal sanctions against false claims of authorship, and for a work as well documented and publicly distributed as qmail, chances of success would be low (though cooperation of djb in any defense would help).

And having a license over a codebase doesn't necessarially free you from conflicting claims of ownership. Hell, it's even possible to imagine a world in which some two-bit thuggish company tried to claim a copyright interest in the Linux kernel.

The better reasons for license, of some sort, are:

A framework for distributing the work, including:
Clear statement of copyright interest.
Clear statement of rights of recipients to modify, use, and redistribute the work.
A clear statement of any additional rights of authorship which are or are not retained (rights not explicitly granted are implicitly retained under US statute).
Clear statement of obligations (if any) when receiving, modifying, using, and/or distributing a work.
A disclaimer of warranty and liability

The cover of an approved license also greatly relieves the burden on those who would like to engage in further distribution, modification, and use of the work. For many FSF Free Software projects, having a clear check that works are granted under an approved and accepted license provides a very real and useful protection against real and imagined legal threats, from both outside and inside the organization. Mirror sites and CD/DVD services for CentOS, Debian, Fedora, and Gentoo come to mind. Likewise, odds of an effective attack against adopting a tool for use within an organization merely because it is licenced under GPL, BSD, or MIT license (and is hence "legally risky") wouldn't get far in any sane environment -- in almost any case such code is already in extant use. "Public domain" is a slightly harier threat at present.

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