Patent 8656159 was granted and assigned to Adobe Inc. on February, 2014 by the United States Patent and Trademark Office.
In some embodiments, a method includes receiving a modifiable electronic document. The method includes generating a new version of the modifiable electronic document. The method also includes encrypting the new version of the modifiable electronic document using an encryption key that is used to encrypt the modifiable electronic document and different versions of the modifiable electronic document. The method includes saving the new version of the modifiable electronic document.