All The Claims

1. An information player for playing back information from a recording medium, the information player comprising:
a cryptography means for decrypting encrypted data recorded in the recording medium by generating a block key for decrypting encrypted data of a block data having an arrival time stamp (ATS) appended to each of a plurality of transport packets from a block seed which is additional information unique to the block data and including the arrival time stamp (ATS), and decrypting each block data with the block key thus generated; and
a transport stream processing means for controlling data output on the basis of the arrival time stamp (ATS) appended to each of the plurality of transport packets included in the block data having been decrypted by the cryptography means.
2. The information player according to claim 1, wherein the cryptography means generates the block key for decrypting the block data from a block seed which is additional information unique to the block data and including the arrival time stamp (ATS) appended to a leading one of the plurality of transport packets included in the block data.
3. The information player according to claim 1, wherein the block seed includes copy control information in addition to the arrival time stamp (ATS).
4. The information player according to claim 1, wherein the cryptography means decrypts, with the block key, only data included in the block data and excluding data in a leading area including a block seed of the block data.
5. The information player according to claim 1, wherein the cryptography means generates a title-unique key from a master key stored in the information player, disc ID being a recording medium identifier unique to a recording medium and a title key unique to data to be recorded to the recording medium, takes the thus-generated title-unique key as a key for an encryption function, places the block seed into the encryption function, and outputs a result of the placement as a block key.
6. The information player according to claim 1, wherein the cryptography means generates a title-unique key from a master key stored in the information player, disc ID being a recording medium identifier unique to a recording medium and a title key unique to data to be recorded to the recording medium, places the title-unique key thus generated and block seed into a one-way function, and outputs a result of the placement as a block key.
7. The information player according to claim 1, wherein the cryptography means generates a device-unique key from any of an LSI key stored in an LSI included in the cryptography means, device key stored in the information player, medium key stored in the recording medium and a drive key stored in a drive unit for the recording medium or a combination of these keys, and generates a block key for decrypting the block data from the device-unique key thus generated and block seed.
8. The information player according to claim 1, wherein the cryptography means decrypts block data with the block key according to a DES algorithm.
9. The information player according to claim 1, further comprising an interface means for receiving information to be recorded to a recording medium, and identifying copy control information appended to each of packets included in the transport stream to judge, based on the copy control information, whether or not playback from the recording medium is allowed.
10. The information player according to claim 1, further comprising an interface means for receiving information to be played back from a recording medium, and identifying 2-bit EMI (encryption mode indicator) as copy control information to judge, based on the EMI, whether or not playback the recording medium is allowed.
11. A method for playing back information from a recording medium, the method comprising the steps of:
generating a block key for decrypting encrypted data in a block data having an arrival time stamp (ATS) appended to each of a plurality of transport packets from a block seed which is additional information unique to the block data and including the arrival time stamp (ATS), and decrypting each block data with the block key thus generated; and
processing a transport stream processing means to control data output on the basis of the arrival time stamp (ATS) appended to each of the plurality of transport packets included in the block data having been decrypted in the decrypting step.
12. The method according to claim 11, wherein in the decrypting step, the block key for decrypting the block data is generated from a block seed which is additional information unique to the block data and including the arrival time stamp (ATS) appended to a leading one of the plurality of transport packets included in the block data.
13. The method according to claim 11, wherein in the decrypting step, only data included in the block data and excluding data in a leading area including a block seed of the block data is decrypted with the block key in the encryption of the block data.
14. The method according to claim 11, wherein in the decrypting step, a title-unique key is generated from a master key stored in the information player, disc ID being a recording medium identifier unique to a recording medium and a title key unique to data to be recorded to the recording medium, the title-unique key thus generated is taken as a key for an encryption function, the block seed is placed into the encryption function, and a result of the placement is outputted as a block key.
15. The method according to claim 11, wherein in the decrypting step, a title-unique key is generated from a master key stored in the information player, disc ID being a recording medium identifier unique to a recording medium and a title key unique to data to be recorded to the recording medium, the title-unique key thus generated and block seed are placed into a one-way function, and a result of the placement is outputted as a block key.
16. The method according to claim 11, wherein in the decrypting step, a device-unique key is generated from any of an LSI key stored in an LSI included in the cryptography means, device key stored in the information player, medium key stored in the recording medium and a drive key stored in a drive unit for the recording medium or a combination of these keys, and a block key for decrypting the block data is generated from the device-unique key thus generated and block seed.
17. The method according to claim 11, wherein in the decrypting step, the block data decryption with the block key is made according to a DES algorithm.
18. The method according to claim 11, further comprising the step of identifying copy control information appended to each of packets included in the transport stream to judge, based on the copy control information, whether or not playback from the recording medium is allowed.
19. The method according to claim 11, further comprising the step of identifying 2-bit EMI (encryption mode indicator) as copy control information to judge, based on the EMI, whether or not playback from the recording medium is allowed.
20. A non-transitory computer readable storage medium that stores a program, which when executed by a computer, causes the computer to perform a method of playback of information from a recording medium comprising the steps of:
generating a block key for decrypting encrypted data in a block data having an arrival time stamp (ATS) appended to each of a plurality of transport packets from a block seed which is additional information unique to the block data and including the arrival time stamp (ATS), and decrypting each block data with the block key thus generated; and
processing a transport stream to control data output on the basis of the arrival time stamp (ATS) appended to each of the plurality of transport packets included in the block data having been decrypted in the decrypting step.

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 stamp pad holder for use in a self-inking hand stamp comprising:
a stamp die box having a top, a bottom and opposite sides,
a stamp forming material mounted at the bottom of the die box, the stamp forming material having an ink receiving side and an image forming side,
an ink cartridge having a top side and a bottom side mounted in the stamp die box, the bottom side adjacent to the ink receiving side of the stamp forming material,
a porous compressible layer mounted to the bottom side of the ink cartridge for increasing the rate of flow of ink from the ink cartridge to the stamp forming material, and
a non permeable film disposed between the ink cartridge and the ink receiving side of the stamp forming material for prohibiting the flow of ink from the ink cartridge to the stamp forming material until the film is removed from between the ink cartridge and the stamp forming material at which time the ink can flow from the ink cartridge through the porous compressible layer to the stamp forming material thereby impregnating the stamp forming material with ink.
2. The stamp pad holder of claim 1 wherein the porous compressible layer is a porous flexible rubber pad.
3. The stamp pad holder of claim 2 wherein the porous compressible layer is made of ink permeable material.
4. The stamp pad holder of claim 3 wherein the porous flexible rubber pad is made of nitrile butadiene rubber.
5. The stamp holder of claim 1 and further comprising pressure applying means for applying a force to the ink cartridge for pushing the porous compressible layer against the stamp forming material.
6. The stamp holder of claim 5 wherein the pressure applying means comprises a pressure plate mounted in the stamp die box between the top and the ink cartridge.
7. A stamp pad holder for use in a self-inking hand stamp comprising:
a stamp die box having a top, a bottom and opposite sides,
a stamp forming material mounted at the bottom of the die box, the stamp forming material having an ink receiving side and an image forming side,
an ink cartridge having a top side and a bottom side mounted in the stamp die box, the bottom side adjacent to the ink receiving side of the stamp forming material,
a porous compressible layer mounted to ink receiving side of the stamp forming material for increasing the rate of flow of ink from the ink cartridge to the stamp forming material, and
a non permeable film disposed between the ink cartridge and the porous compressible layer for prohibiting the flow of ink from the ink cartridge to the porous compressible layer until the film is removed from between the ink cartridge and the porous compressible layer at which time the ink can flow from the ink cartridge through the porous compressible layer to the stamp forming material thereby impregnating the stamp forming material with ink.
8. The stamp pad holder of claim 7 wherein the porous compressible layer is a porous flexible rubber pad.
9. The stamp pad holder of claim 8 wherein the porous compressible layer is made of ink permeable material.
10. The stamp pad holder of claim 9 wherein the porous flexible rubber pad is made of nitrile butadiene rubber.
11. The stamp holder of claim 7 and further comprising pressure applying means for applying a force to the ink cartridge for pushing the porous compressible layer against the stamp forming material.
12. The stamp holder of claim 11 wherein the pressure applying means comprises a pressure plate mounted in the stamp die box between the top and the ink cartridge.
13. A stamp pad holder for use in a self-inking hand stamp comprising:
a stamp die box having a top, a bottom and sides, and a removable cover at the top of the die box,
mechanical interlocking means on the sides for being slidably received by the self-inking hand stamp for releasably and securely retaining the stamp die box to the self-inking hand stamp,
a stamp forming material mounted at the bottom of the die box, the stamp forming material having an ink receiving side and an image forming side and perimeter edges, the perimeter edges of the stamp forming material totally contained within the die box,
a framing member mounted inside the die box adjacent to the sides, the framing member having a thickness.
an ink cartridge having a top side and a bottom side mounted in the framing member and separated from the sides by the thickness of the framing member, the ink cartridge adjacent to the ink receiving side of the stamp forming material,
a porous compressible layer mounted to the bottom side of the ink cartridge for increasing the rate of flow of ink from the ink cartridge to the stamp forming material,
pressure applying means disposed between the cover and the ink cartridge for applying a force to the ink cartridge for pushing the porous compressible layer mounted to the bottom of the ink cartridge against the stamp forming material, the cover securing the stamp forming material, pressure applying means, ink cartridge and framing member inside the die box, and
a non permeable film disposed between the porous compressible layer and the ink receiving side of the stamp forming material for prohibiting the flow of ink from the porous compressible layer to the stamp forming material until the film is removed from between the porous compressible layer and the stamp forming material at which time the ink can flow from the porous compressible layer to the stamp forming material thereby impregnating the stamp forming material with ink.
14. The stamp pad holder of claim 13 and further comprising exit means on the die box for allowing the non permeable film to be pulled out from the die box.

1. A reamer shoe for mounting on a tubing string, the reamer shoe having a reaming area supporting a plurality of discrete reaming members, wherein the plurality of reaming members have complete circumferential coverage of the shoe body but the individual reaming members are non-continuous and do not fully extend either longitudinally along or circumferentially around the reaming area on the shoe body.
2. A reamer shoe as claimed in claim 1 wherein the reaming members are diamond shaped.
3. A reamer shoe as claimed in claim 1 wherein the reaming members are formed as discrete simple geometrical shapes.
4. A reamer shoe as claimed in any one of the preceding claims wherein the reaming members are separated by void areas which permit by pass of fluid over the reaming area, between the reaming members.
5. A reamer shoe as claimed in any one of the preceding claims having a plurality of flow by areas or flow ports to allow lubrication of the shoe.
6. A reamer shoe as claimed in any one of the preceding claims wherein the reaming members are made of a hard wearing and resistant material, such as tungsten carbide or polycrystalline diamond.
7. A reamer shoe as claimed in any one of the preceding claims wherein the reaming members are securely attached to the shoe body by a welding process.
8. A reamer shoe as claimed in any one of the preceding claims 1 to 6 wherein the reaming members are securely attached to the shoe body by a mechanical locking technique.
9. A reamer shoe as claimed in any one of the preceding claims having connection means for mounting the reamer shoe on a tubing string.
10. A reamer shoe as claimed in any one of the preceding claims having an internal diameter which is at least equal to, or greater than the internal diameter of the casing.
11. A reamer shoe as claimed in any one of the preceding claims further comprising a stabiliser or centraliser.

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 method comprising:
a transmitting station monitoring a shared-communications medium for an opportunity to transmit a first signal and a second signal via the shared-communications medium;
the transmitting station transmitting the second signal using a second modulation format on the shared communications medium, the second signal conveying a particular frame that includes a destination address of the transmitting station and indicates a duration for which the shared-communications medium is reserved, and
the transmitting station transmitting the first signal in accordance with a first modulation format on the shared-communications medium after the second signal without waiting for a responsive transmission to the second signal, wherein the first signal conveys at least one data frame within the duration indicated in the particular frame.
2. The method of claim 1, wherein the second modulation format is different than the first modulation format.
3. The method of claim 1, wherein the first modulation format comprises orthogonal frequency division multiplexing (OFDM) and the second modulation format comprises complementary code keying (CCK).
4. The method of claim 1, further comprising the transmitting station
transmitting a third signal on the shared-communications medium within the duration indicated in the particular frame, wherein the third signal conveys a data frame in accordance with the second modulation format that reinforces the duration indicated in the particular frame.
5. The method of claim 1, wherein the particular frame and the at least one data frame are each addressed to different destination addresses.
6. The method of claim 1, wherein the duration indicates an expected transmission time of the at least one data frame.
7. The method of claim 1, wherein the duration indicates, to a receiving station, to refrain from transmitting for the duration.
8. A station comprising:
a transmitter for transmitting a first signal and a second signal on a shared communications medium, the transmitter configured to:
transmit the second signal using a second modulation format on the shared-communications medium, the second signal conveying a particular frame that includes a destination address of the transmitting station, the second signal further indicating a duration; and
transmit the first signal in accordance with a first modulation format on the shared-communications medium after the second signal without waiting for a responsive transmission to the second signal, wherein the first signal conveys at least one data frame within the duration.
9. The station of claim 8, wherein the second modulation format is different than the first modulation format.
10. The station of claim 8, wherein the first modulation format comprises orthogonal frequency division multiplexing (OFDM) and the second modulation format comprises complementary code keying (CCK).
11. The station of claim 8, wherein the transmitter also transmits a third signal on the shared-communications medium, conveying a data frame in accordance with the second modulation format that reinforces the duration indicated in the particular frame.
12. The station of claim 8, wherein the particular frame and the at least one data frame are each addressed to different destination addresses.
13. The station of claim 8, wherein the duration indicates an expected transmission time of the at least one data frame.
14. The station of claim 8, wherein the duration indicates, to a receiving station, to refrain from transmitting for the duration.
15. A method comprising:
monitoring a shared-communications medium at a transmitting station for an opportunity to transmit a first signal, a second signal, and a third signal via the shared-communications medium;
transmitting the second signal from the transmitting station in accordance with a second modulation format on the shared-communications medium, the second signal conveying a particular frame that includes a destination address of the transmitting station and indicates a duration for which the shared-communications medium is reserved;
transmitting the first signal from the transmitting station in accordance with a first modulation format on the shared-communications medium after the second signal without waiting for a responsive transmission to the second signal, wherein the first signal conveys at least one data frame within the duration indicated in the particular frame; and
transmitting the third signal from the transmitting station in accordance with the second modulation format on the shared communications medium after the first signal, wherein the third signal conveys a data frame.
16. The method of claim 15, wherein the second modulation format is different than the first modulation format.
17. The method of claim 15, wherein the first modulation format comprises orthogonal frequency division multiplexing (OFDM) and the second modulation format comprises complementary code keying (CCK).
18. The method of claim 15, wherein the particular frame and the at least one data frame are each addressed to different destination addresses.
19. The method of claim 15, wherein the shared-communications medium is operative in the 2.4 GHz Industrial, Scientific, Medical band of the radio frequency spectrum.
20. The method of claim 15, wherein the duration indicates an expected transmission time of the at least one data frame.
21. The method of claim 15, wherein the duration indicates, to a receiving station, to refrain from transmitting for the duration.
22. A station comprising:
a transmitter for transmitting a first signal, a second signal, and a third signal on a shared communications medium, the transmitter configured to:
transmit the second signal in accordance with a second modulation format on the shared-communications medium, the second signal conveying a particular frame that includes a destination address of the station and indicates a duration for which the shared communications medium is reserved;
transmit the first signal in accordance with a first modulation format on the shared-communications medium after the second signal without waiting for a responsive transmission to the second signal, wherein the first signal conveys at least one data frame within the duration; and
transmit the third signal in accordance with the second modulation format on the shared communications medium after the first signal, wherein the third signal conveys another data frame within the duration indicated in the particular frame.
23. The station of claim 22, wherein the second modulation format is different than the first modulation format.
24. The station of claim 22, wherein the first modulation format comprises orthogonal frequency division multiplexing (OFDM) and the second modulation format comprises complementary code keying (CCK).
25. The station of claim 22, wherein the transmitter also transmits the third signal on the shared-communications medium, conveying a data frame in accordance with the second modulation format that reinforces the duration indicated in the particular frame.
26. The station of claim 22, wherein the particular frame and the at least one data frame are each addressed to different destination addresses.
27. The station of claim 22, wherein the duration indicates, to a receiving station, to refrain from transmitting for the duration.
28. A station comprising: means for transmitting a second signal using a second modulation format on a shared-communications medium, the second signal conveying a particular frame that includes a destination address of the transmitting station and indicates a duration for which the shared-communications medium is reserved; and
means for transmitting a first signal in accordance with a first modulation format on the shared-communications medium after the second signal without waiting for a responsive transmission to the second signal, wherein the first signal conveys at least one data frame within the duration indicated in the particular frame.
29. A station comprising:
a processor;
a transmitter capable of transmitting on a shared-communications medium; and a memory storing processor-executable instructions that, when executed by the processor, cause the processor to perform operations comprising:
monitoring the shared-communications medium for an opportunity to transmit a first signal and a second signal via the shared-communications medium;
transmitting the first signal from the transmitting station in accordance with a first modulation format on the shared-communications medium after the second signal without waiting for a responsive transmission to the second signal,
transmitting the first signal from the transmitting station in accordance with a first modulation format on the shared-communications medium after the second signal, wherein the first signal conveys at least one data frame within the duration indicated in the particular frame.
30. The method of claim 1, further comprising transmitting the first signal immediately after transmitting the second signal.
31. The method of claim 30, wherein the particular frame is one of a clear-to-send (CTS) frame and a null data frame.
32. The station of claim 8, further comprising transmitting the first signal immediately after transmitting the second signal.
33. The station of claim 32, wherein the particular frame is one of a clear-to-send (CTS) frame and a null data frame.
34. The station of claim 28, wherein the means for transmitting the first signal transmits the first signal immediately after the means for transmitting the second signal transmits the second signal.
35. The station of claim 34, wherein the particular frame is one of a clear-to-send (CTS) frame and a null data frame.
36. The station of claim 29, wherein transmitting the first signal further comprises transmitting the first signal immediately after transmitting the second signal.
37. The station of claim 36, wherein the particular frame is one of a clear-to-send (CTS) frame and a null data frame.