This can be done with a ToPAS-like tool.
This is much harder to do. Having a website is not enough as you could have kept the information secret (but timestamped) until yesterday. To be perfect sure this you should have published your work in reputable magazines. However, as Savannah is known for publishing everything publishing here is probably enough.
A thing that will not work is publishing on some obscure and mostly unknown website.
As long as the normal open development process is not properly timestamped it is counter productive to assume that this is the case. Here is the table from FFII expanded with the relevant column.
|Perfect Defensive Publishing||Time-Stamping of the normal open development process||The normal open development process|
|Patent-relevant ideas easy to research||Patent-relevant ideas hard to find.||Patent-relevant ideas hard to find.|
|Great effort and costs for the developper, lesser effort for the researcher and patent applicant||Less effort and costs for the developper, greater effort and costs for the searcher||Less effort and costs for the developer, less effort and cost for the searcher|
|Lower patenting costs, more (broad and trivial) software patents||Higher patenting costs, less (broad and trivial) patents||Lower patenting costs, more (broad and trivial) software patents|
|Your software idea will probably not be patented by anybody||Your software idea may be patented by someone, but that patent owner will avoid all conflicts with you and other free software developpers as soon as you show him your proof of prior art. He will become very cautious even with his other patents, especially toward free software developpers, because they can do him a lot of uncalculable harm. He will prefer to keep some invalid patents so as to placate his investors and raise funds, rather than really risk offending anyone. In some cases he will even pay you to keep silent about your prior art findings.||Your software idea may be patented by someone. You will not be able to prove prior art and may be forced to pay royalties.|
|A lot of fortune-seekers will gather around the defensive-publishing database and in order to see what ideas could be patent-relevant and then see if they can find some complementary ideas for themselves to patent. These patents will then probably be valid. Your field of work will be blocked by a patent thicket.||No fortune-seeker will find your prior art information in time and you will keep a head-start, having good chances to step by step make a whole field of ideas patent-free.||Fortune-seeker may find your information and patent it. The patent may be impossible to invalidate as the prior art is not timestamped.|
|Patent offices may look credible when they say: "Look, we have done our part to search prior art. The free software developpers should stop whining and engange in defensive-publishing. If they do their job of building prior-art databases, then we will do ours of guaranteeing that their ideas aren't patented."||Patent offices may have to admit that the problem of harnessing prior art in software is not "just a matter of time".||Patent offices may look credible when they say: "Look, we have done our part to search prior art. The free software developers should stop whining and get the documentation straight if they feel they have prior art."|