11. A memory device having instructions stored thereon that, in response to execution by a processing device, cause the processing device to perform operations comprising: embedding a control mark within an electronic document created by a document word processor, wherein the control mark remains embedded in the electronic document after changing a body of the electronic document with the document word processor; wherein the control mark cannot be changed by or removed with the document word processor; and wherein the control mark includes an encrypted check sum configured to self-authenticate or self-validate the electronic document; and detecting transmitted network packets containing the electronic document, based on the control mark; making a determination that the electronic document contained in at least one of the transmitted packets has been changed; and blocking access to the electronic document contained in the at least one of the transmitted packets in response to the determination.
11. A memory device having instructions stored thereon that, in response to execution by a processing device, cause the processing device to perform operations comprising: embedding a control mark within an electronic document created by a document word processor, wherein the control mark remains embedded in the electronic document after changing a body of the electronic document with the document word processor; wherein the control mark cannot be changed by or removed with the document word processor; and wherein the control mark includes an encrypted check sum configured to self-authenticate or self-validate the electronic document; and detecting transmitted network packets containing the electronic document, based on the control mark; making a determination that the electronic document contained in at least one of the transmitted packets has been changed; and blocking access to the electronic document contained in the at least one of the transmitted packets in response to the determination. 17. The memory device of claim 11 wherein said detecting further includes monitoring network packets transmitted to an internal organization network from an external organization network.