As PrimarilyPublicDomain is to PublicDomain, so you can construct other licenses: <nowiki>PrimarilyShareAlike</nowiki> to ShareAlike, <nowiki>PrimarilyGFDL</nowiki> to the FreeDocumentationLicense, and so forth.

Just as you can mark an entire site PrimarilyPublicDomain, so you could mark an entire site <nowiki>PrimarilyShareAlike</nowiki>. This gets some of the benefits of CopyLeft, but has the advantage of being somewhat compatible with content under a much wider variety of licenses. So, if some members of the TargetGroup want to be AllRightsReserved, you can do that. If you want to make heavy use of FairUse laws, you can do that too. It's all good.

But CopyLeft is actually meant to prevent people from doing this - from combining restricted text and non-restricted text in the same work. So you have to use some tricks: there are two dubious ones, recommended for use if you intend to immediately fold in the face of a serious LegalThreat anyway.

* Aggregation. most copyleft licenses allow you to "aggregate" copyleft and copyright on, for example, the same hard disk or CD, provided that they are kept somehow seperate. So you can try to interpret this creatively to include content on the same website but different webpages.
* Bizarre interpretations of the license. RichardStallman has been quoted as saying that he sees "no problem" with combining copyleft (GFDL) works with copyrighted works, where the latter is small enough to be FairUse. This kind of "logic" could be extended to its illogical conclusion... ;-)

A somewhat better approach would be a LicenseToLicense. Take all the normal implicit rights you get from DefaultCopyright. Then, also take the right to license what results under the copyleft license of your choice, except where it is explicitly marked otherwise. Now look really hard for loopholes, because this sort of convoluted license is liable to be riddled with holes, and it's not really been done before. Better, get a lawyer.

Still, you have to consider whether the benefits are worth it. PrimarilyPublicDomain, and a non-legal request, might get you close to what you want, without the hassle. 

''the above text is PrimarilyPublicDomain''

CategoryCopyright

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Aggregation and other "bizarre" interpretations are only as strong as a jury of 12 peers would have them be. If it seems like you are stretching the license too far, then you will likely lose the case. Even more practically, if you are not prepared to defend your practice either by first destroying the offending material or by defending yourself in court if you cannot destroy the material (i.e. already published and released), you should not go this route. A simpler solution is to forego legally troubled things like CopyLeft entirely and stick to licenses with better FeatureKarma. -- SunirShah