18. A system comprising: means for receiving a message that includes a document and an encrypted access code; means for generating an image, based on the message, that includes the encrypted access code; means for capturing a copy of the image; means for decrypting the encrypted access code from the copy of the image using information stored in the means for capturing to yield a decrypted access code; and means for generating an output, including the decrypted access code, that allows access to the document.
18. A system comprising: means for receiving a message that includes a document and an encrypted access code; means for generating an image, based on the message, that includes the encrypted access code; means for capturing a copy of the image; means for decrypting the encrypted access code from the copy of the image using information stored in the means for capturing to yield a decrypted access code; and means for generating an output, including the decrypted access code, that allows access to the document. 20. The system of claim 18 , further comprising means for displaying the output.