With most legal contracts there is always the issue that perhaps the legibility may be lost. This could happen through accident or maliciousness. My solution is to have very thin Near Field Communication (NFC) circuits (http://s.hswstatic.com/gif/nfc-tag-2.jpg) that can then hold both the text of the document and the encrypted signatures of those involved.
Most paper used for long term contracts are of a heavier bond than normal paper, this should allow for the above NFC tags to be inserted into the paper, much like a watermark, with layer of paper both the top and bottom of the tag. These tags can hold a variable amount of data and can be encrypted.
With my idea, the tag is programmed to hold the encrypted text of the document so that it can be double checked in the future. As an additional security measure, we can use the NFC "signatures" of individuals. There are currently a wide variety of implemented NFC devices, from mobile phones to rings. This would allow us to bring back signet rings which can now be made that hold an encrypted signature with their own nfc chip. http://nfcring.com/
The mixing of these technologies would allow for encryption and double authentication of various legal documents by having both a physical signature on the paper from multiple people as well as having the encrypted signature of each signatory.
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