[SoftTalker]

Everyone is overlooking the reality that multiple parties have a copy of the documents, and a judge is not going to believe that the seller agreed to 10% of market value when they claim otherwise and they have a document backing it up and so does their lawyer and so does their real estate agent. And you are going to be charged with a crime if you attempt something like this.

[digitaltrees]

There are plenty of examples of a single set of documents with no corroborating documents. In fact, when I was a lawyer for Lehman in 2008 most mortgage transfers were a line in a spreadsheet not a legal document. Many wills have only a single copy that was kept in a safe deposit box. I could go on and on.

[SoftTalker]

The fact remains that altering a photocopied or faxed copy of a document has been trivially easy for decades and yet it's not really a problem in real life, because it's a criminal act to do so and present it as authentic.