Invisible encoding of meta-information
First Claim
1. An encoder for encoding meta-information that is associated with a document, the encoder comprisingan invisibility encoder that is configured to receive the meta-information and to generate therefrom a group of meta-information characters that are invisible when rendered together with the document.
2 Assignments
0 Petitions
Accused Products
Abstract
Meta-information, such as a digital watermark, that is associated with a document is encoded by using characters, or sequences of characters, that are “invisible” when rendered. Characters such as spaces, tabs, carriage returns, backspaces, line feeds, and so on are used to encode the watermark. The encoded “invisible” meta-information item is preferably appended to the document. A receiving device that is compatible with this encoding is able to decode and process the meta-information, for example, to verify the contents and/or the originator of the document. A receiving device that is not compatible with this encoding will merely display or print additional “white space” corresponding to the “invisible” meta-information. By appending this invisible encoding to the document, this additional white space will occur after the display or printing of the document, in a visually unobtrusive form.
103 Citations
20 Claims
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1. An encoder for encoding meta-information that is associated with a document, the encoder comprising
an invisibility encoder that is configured to receive the meta-information and to generate therefrom a group of meta-information characters that are invisible when rendered together with the document.
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6. A method of facilitating an encoding of meta-information, the method comprising:
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enabling a generation of a group of meta-information characters that are invisible when rendered together with a document related to the meta-information, the group of meta-information characters corresponding to the m eta-information. - View Dependent Claims (7, 8, 9, 10)
enabling a generation of the meta-information, based on a content of a document.
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8. The method of claim 7, wherein enabling the generation of the meta-information includes:
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enabling a determination of a parameter corresponding to a content of the document, and enabling an encryption of the parameter to form the meta-information.
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9. The method of claim 6, further including
enabling an attachment of the group of mete-information characters to the document. -
10. The method of claim 6, wherein the group of meta-information characters corresponds to a binary representation of the meta-information.
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11. A decoder comprising:
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a receiver that is configured to receive a document comprising content material and a group of meta-information characters that are invisible when rendered together with the document, the group of meta-information characters corresponding to meta-information that is associated with the document, an invisibility decoder, operably coupled to the receiver, that is configured to decode the group of meta-information characters to form the meta-information. - View Dependent Claims (12, 13, 14)
a processor that is configured to process the content material to form a second content parameter corresponding to the document, and a comparator that is configured to compare the first content parameter and the second content parameter to facilitate a verification of the content material of the document.
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13. The decoder of claim 12, further including
a decrypter that is configured to decrypt the meta-information to provide the first content parameter. -
14. The decoder of claim 11, further including
a display device that displays the content material.
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15. A method to facilitate a decoding of meta-information that is associated with a document, the method comprising:
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enabling a receipt of the document comprising content material and a group of meta-information characters that are invisible when rendered together with the document, the group of meta-information characters corresponding to the meta-information, enabling a decoding of the group of meta-information characters to form the meta-information. - View Dependent Claims (16, 17)
enabling a processing of the content material to form a second content parameter corresponding to the document, and enabling a comparison of the first content parameter and the second content parameter to facilitate a verification of the content material of the document.
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17. The method of claim 16, further including
enabling a decryption of the meta-information to provide the first content parameter.
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18. An encoded document comprising:
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content material, and a group of meta-information characters that are invisible when rendered together with the content material, the group of meta-information characters corresponding to meta-information that is associated with the content material. - View Dependent Claims (19, 20)
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Specification