What is claimed:
1. A filtration funnel with integral prefilter comprising:
a funnel comprising a reservoir for holding unfiltered fluid therein and an outlet,
a final filter disposed between said reservoir and said outlet, said final filter sealed to said funnel to prevent unfiltered fluid from flowing between said final filter and said outlet, with the downstream side of said final filter in fluid flow communication with said outlet,
one or more prefilters disposed between said reservoir and the upstream side of said final filter,
a seal ring disposed above said one or more prefilters, said seal ring sealed to said funnel, with the bottom surface of said seal ring pressing against the outer periphery of the upstream surface of said one or more prefilters, thereby sealing said one or more prefilters to said funnel with a non-absolute seal, thereby causing said unfiltered fluid to flow through said one or more prefilters before flowing through said final filter, thereby increasing the volume of fluid that the filtration funnel can filter.
2. The filtration funnel of claim 1 wherein said final filter is a microporous filter.
3. The filtration funnel of claim 2 wherein the pore size of said microporous filter is less than or equal to 1.5 m.
4. The filtration funnel of claim 3 wherein said at least one prefilter contains a first prefilter, said first prefilter disposed above said final filter, said first prefilter having an open pore size, thereby functioning as a flow distributor.
5. The filtration funnel of claim 4 wherein said at least one prefilter contains a second prefilter, said second prefilter disposed above said first prefilter, said second prefilter being a microporous filter with a pore size greater than that of said final filter.
6. The filtration funnel of claim 5 wherein said at least one prefilter contains a third prefilter, said third prefilter disposed above said second prefilter, said third prefilter being a depth filter capable of protecting said second prefilter.
7. The filtration funnel of claim 1 wherein said at least one prefilter contains a first prefilter, said first prefilter disposed above said final filter, said first prefilter being a depth filter capable of protecting said final filter.
8. The filtration funnel of claim 1 wherein said seal ring is sealed to said funnel with a press fit between the outer edge of said seal ring, and the inner wall of said funnel.
9. The filtration funnel of claim 1 wherein said filtration funnel is disposable.
10. A filtration apparatus for filtering a fluid comprising:
a filtration funnel with integral prefilter comprising:
a funnel comprising a reservoir for holding unfiltered fluid therein and an outlet,
a final filter disposed between said reservoir and said outlet, said final filter sealed to said funnel to prevent unfiltered fluid from flowing between said final filter and said outlet, with the downstream side of said final filter in fluid flow communication with said outlet,
one or more prefilters disposed between said reservoir and the upstream side of said final filter,
a seal ring disposed above said one or more prefilters, said seal ring sealed to said funnel, with the bottom surface of said seal ring pressing against the outer periphery of the upstream surface of said one or more prefilters, thereby sealing said one or more prefilters to said funnel with a non-absolute seal, thereby causing said unfiltered fluid to flow through said one or more prefilters before flowing through said final filter, thereby increasing the volume of fluid that the filtration funnel can filter,
a means to collect filtered fluid from said outlet of said funnel,
a means to apply a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel.
11. The filtration apparatus of claim 10 wherein the means to collect filtered fluid from the outlet of said funnel is a bottle disposed below said funnel, with the outlet of said funnel in fluid flow communication with the interior of said bottle.
12. The filtration apparatus of claim 11 wherein the top of said unfiltered fluid in said reservoir is vented to atmosphere, and wherein a vacuum is applied to the interior of said bottle, thereby creating a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel, thereby sucking said unfiltered fluid from said reservoir, through said at least one prefilter, through said final filter, through said outlet, into said bottle.
13. The filtration funnel of claim 12 wherein said final filter is a microporous filter.
14. The filtration funnel of claim 13 wherein the pore size of said microporous filter is less than or equal to 1.5 m.
15. The filtration funnel of claim 14 wherein said at least one prefilter contains a first prefilter, said first prefilter disposed above said final filter, said first prefilter having an open pore size, thereby functioning as a flow distributor.
16. The filtration funnel of claim 15 wherein said at least one prefilter contains a second prefilter, said second prefilter disposed above said first prefilter, said second prefilter being a microporous filter with a pore size greater than that of said final filter.
17. The filtration funnel of claim 16 wherein said at least one prefilter contains a third prefilter, said third prefilter disposed above said second prefilter, said third prefilter being a depth filter capable of protecting said second prefilter.
18. The filtration funnel of claim 13 wherein said at least one prefilter contains a first prefilter, said first prefilter disposed above said final filter, said first prefilter being a depth filter capable of protecting said final filter.
19. The filtration apparatus of claim 1 1 wherein the top of said unfiltered fluid in said reservoir is pressurized, and wherein the interior of said bottle is vented to atmosphere, thereby creating a differential pressure between the top of said unfiltered fluid in said reservoir, and said outlet of said funnel, thereby forcing said unfiltered fluid from said reservoir, through said at least one prefilter, through said final filter, through said outlet, into said bottle.
20. The filtration apparatus of claim 10 wherein said filtration apparatus is disposable.
The claims below are in addition to those above.
All refrences to claim(s) which appear below refer to the numbering after this setence.
1. A processor-implemented method of tracing a traitor from a circumvention device, the circumvention device comprising a set of compromised device keys obtained from the traitor, the method comprising:
generating a hypothesized model on a hypothesized set of device keys that models a hypothesis that the circumvention device comprises the hypothesized set of device keys, wherein the hypothesized model is represented by any of a tabular form, a function, a graphical model, and a Bayesian network;
passing the hypothesized model to a subset tracing method to identify a compromised device key, the subset tracing method comprising;
generating a circumvention device model that models a behavior of a circumvention device, wherein
the circumvention device model comprises a set of tests from which tests are selected, a set of key sets comprising one key set for each of the set of tests, and a probability for each of the key sets indicating a probability that the circumvention device will play the one of the set of tests associated with the key set: and
the circumvention device model is represented by any of a tabular form, a function, a graphical model, and a Bayesian network:
selecting a test, utilizing gained informativeness information and based on the hypothesized model and the circumvention device model, to apply to the circumvention device, wherein the test comprises a forensic media key block that obtains informative data about the compromised device key by observing the response:
receiving a response from the circumvention device, the response indicating a success of the test in playing a protected content on the circumvention device:
updating the hypothesized model using the received response, incorporating the response into the hypothesized model using any of a graphic model or a Bayesian network, and using the selected test, a current version of the hypothesized model, and a current version of the circumvention device model for selecting at least one test that identifies the compromised device keys obtained from the traitor: and
testing the hypothesized model to determine the strength of the belief that the compromised device key is contained in the circumvention device
removing the compromised key, adding new keys to the hypothesized set of keys and updating the hypothesized model, wherein updating the hypothesized model comprises:
generating the probabilities of the newly added keys being in the circumvention device: and
applying an inference logic using any of a variable elimination, a belief propagation, and a junction tree, wherein the inference logic utilizes an approximation algorithm comprising any of a sample based approximation, a partition-based approximation, and a loopy belief propagation:
iteratively detecting additional compromised device keys from the set of compromised device keys, until substantially all the compromised device keys in the set of compromised device keys are identified so as to disable the circumvention device; and
creating a media key block MKB on the hypothesized set of device keys that disables the circumvention device.
2-37. (canceled)