See:

    http://www.gnu.org/philosophy/license-list.html#DocumentationLicenses

"Dave Thomas" <Dave / PragmaticProgrammer.com> wrote in message
news:m2u26riags.fsf / zip.local.thomases.com...
>
> Say we were thinking about open-sourcing a publication.
>
> Does anyone have any good references for issues that we might
> encounter, licenses we might use and so on? I've got the information
> on the opencontent.org site, and was wondering if there are any other
> models.
>
> TIA
>
>
> Dave