13. A data processing system comprising a computer readable memory unit, said memory unit containing computer readable program code stored therein, said program code configured to be executed in the data processing system to implement a method for selective decryption within an encrypted document, said method comprising: detecting an encrypted portion of a document, said encrypted portion having been selected and marked for decryption, said encrypted portion being an encryption of a text portion of the document, said text portion comprising a known character string that had been added to the text portion prior to the text portion being encrypted; receiving a selection of a valid key configured to decrypt the encrypted portion; ascertaining that an attempt to convert the encrypted portion into a decrypted portion of the document by decrypting the encrypted portion using the valid key was successful, said ascertaining comprising determining that the decrypted portion includes the known character string; in response to said ascertaining, removing the known character string from the decrypted portion; after said removing the known character string, displaying the decrypted portion.
13. A data processing system comprising a computer readable memory unit, said memory unit containing computer readable program code stored therein, said program code configured to be executed in the data processing system to implement a method for selective decryption within an encrypted document, said method comprising: detecting an encrypted portion of a document, said encrypted portion having been selected and marked for decryption, said encrypted portion being an encryption of a text portion of the document, said text portion comprising a known character string that had been added to the text portion prior to the text portion being encrypted; receiving a selection of a valid key configured to decrypt the encrypted portion; ascertaining that an attempt to convert the encrypted portion into a decrypted portion of the document by decrypting the encrypted portion using the valid key was successful, said ascertaining comprising determining that the decrypted portion includes the known character string; in response to said ascertaining, removing the known character string from the decrypted portion; after said removing the known character string, displaying the decrypted portion. 17. The system of claim 13 , wherein the method further comprises: receiving a selection of multiple keys; and selecting the key by attempting to decrypt the encrypted portion successively with each key of the multiple keys until said ascertaining has been has been performed with the valid key.