1. A method comprising: transitioning from a previous state to a next state in accordance with a security policy; retrieving, responsive to the transitioning, a file key from a security information portion of a secured document, wherein the file key is encrypted by a first encryption in accordance with the previous state; producing a decrypted file key, wherein producing the decrypted file key comprises decrypting the file key encrypted by the first encryption, wherein the decrypted file key is usable to decrypt an encrypted data portion of the secured document; and re-encrypting the decrypted file key with a second encryption in accordance with the next state, wherein the first encryption and the second encryption are different.