13. An electronic device comprising: a non-transitory storage media to store a modular document that is composed of plural parts; and a processor to: associate an access right policy with at least a particular one of the parts that defines one or more criteria under which content of the particular part is inaccessible; and associate a conditional update program with the particular part that defines how the particular part is to be modified when presenting the modular document when the content of the particular part is inaccessible based on the access right policy; execute the conditional update program to modify the content of the particular part, wherein modifying the content of the particular part comprises producing a summary or a redacted version of the content of the particular part or adding an annotation with respect to the particular part; and present the modular document with the modified content of the particular part.
13. An electronic device comprising: a non-transitory storage media to store a modular document that is composed of plural parts; and a processor to: associate an access right policy with at least a particular one of the parts that defines one or more criteria under which content of the particular part is inaccessible; and associate a conditional update program with the particular part that defines how the particular part is to be modified when presenting the modular document when the content of the particular part is inaccessible based on the access right policy; execute the conditional update program to modify the content of the particular part, wherein modifying the content of the particular part comprises producing a summary or a redacted version of the content of the particular part or adding an annotation with respect to the particular part; and present the modular document with the modified content of the particular part. 14. The electronic device of claim 13 , wherein the processor is configured to further: determine whether a destination electronic device to which the modular document is to be sent is able to satisfy the access right policy of the particular part; and in response to determining that the destination electronic device is unable to satisfy the access right policy of the particular part, omit the particular part from a package containing the modular document that is sent to the destination electronic device.