23. The computer program product of claim 14 , further comprising instructions operable to cause a computer system to create a template defining the destination.
14. A computer program product, tangibly stored on a computer-readable storage device, the product comprising instructions operable to cause a computer system to: identify repurposable information in an electronic document, the repurposable information being less than all of the content in the electronic document; define one or more repurposing constraints for the repurposable information, the repurposing constraints identifying an authorized destination for the repurposable information; and receiving a digital signature for the repurposable information and the one or more repurposing constraints, the digital signature authenticating the repurposable information, the digital signature verifying that the repurposable information has not been altered since it was signed, the digital signature being maintained by the authorized destination when the repurposable information is repurposed.