All rights reserved?

[Alp Toker <alp@atoker.com>]

Is the term "All rights reserved" compatible with Open Source/Free 
Software licensing?

If so, is it still considered bad form? I've taken up maintainership of 
some code with headers that go:

/* Copyright (c) 2006 Joe Author. All rights reserved.
 * <standard free license here>
 */

Should the original authors be asked to change this, or is this a case 
of splitting hairs?

For the sake of keeping on-topic:

alp@rover:/usr/share/doc$ grep -ri "all rights reserved" * | wc -l
2204