6. Attribution Rights

Both OSL and AFL

You must retain, in the Source Code of any Derivative Works that You create, all copyright, patent or trademark notices from the Source Code of the Original Work, as well as any notices of licensing and any descriptive text identified therein as an "Attribution Notice." You must cause the Source Code for any Derivative Works that You create to carry a prominent Attribution Notice reasonably calculated to inform recipients that You have modified the Original Work.

Section 6 of the OSL/AFL is intended to protect the reputations of contributors and distributors as their Original Works are copied , modified, and distributed by downstream licen-sees.

Note that this provision deals with the Source Code of the Original Work or Derivative Works . It does not affect executable versions of the software in any way.

The first sentence prevents licensees from removing any notices in the Source Code that would reasonably serve to identify the Original Work . Such notices include "copyright, patent or trademark notices" (such as the copyright notice on this book); "licensing notices" (such as the licensing notice described in the first paragraph of the AFL/OSL licenses); and "any descriptive text identified therein as an Attribution Notice."

The second sentence prevents licensees from implying that the original licensor is responsible for their Derivative Works . Licensees must place notices in the Source Code of their Derivative Works that would reasonably serve to notify recipients that the Original Work has been changed.

Comparison to Other Licenses

This provision of the OSL/AFL is intended to accomplish what the Artistic License sought without the confusing other terms and conditions of that license. (See the discussion in Chapter 5 about the Artistic License.)

The advertising clause that the University of California removed from the BSD license was a much more onerous version of the first sentence of the OSL/AFL attribution rights provision. That provision read:

All advertising materials mentioning features or use of this software must display the following acknowledgement : This product includes software developed by the University of California, Berkeley and its contributors. ( BSD license provision now deleted.)

That BSD advertising clause affected "all advertising materials," but the OSL/AFL only affects the Source Code.