The present invention allows the user (author or creator) of a document to
specify that certain portions of a document be selected for encryption
while other portions of the document remain displayed as created. In
addition, each encrypted section could have multiple encryption keys such
that some viewers can review certain parts of the document while other
viewers will not have that same access. The user could employ a standard
word processing editor technique to highlight (or swipe) portions of a
document that the user desires to be encrypted. The highlighted portion
would then be `tagged` with a surrounding attribute indicating to the
word processor that this highlighted portion of the document is to be
encrypted. The highlighted sections would also have encryption keys
associated with the highlighted and encrypted section. Any one of the
encryption keys for that section would decrypt that section. With proper
authorization, any encrypted portion of a document would be displayed as
part of the document. Without proper authorization, the display of the
document would only contain the unencrypted portions of the document.