[TriLUG] OT: Maintaining public/private versions of a document

[Brian via TriLUG]

Hi Gang,

I'm wondering if anyone has any tips on good software to use for 
maintaining a document in two forms, a "private" version that is 
complete, and a "public" version that excludes certain portions of the 
private version.  I'd love to be able to only modify the private 
version, somehow mark which sections are private, and have the public 
version stay in sync.  I'm not super-concerned with what format the 
source is in, but publishing to annotated PDF (that is, PDF including 
working intradocument links) would be a hard requirement.

Offhand I bet this is something LaTeX could handle, but I don't know 
anything about actually using LaTeX, and would prefer a WYSIWYG editing 
experience.

The particular use case is API documentation for a project I'm on. 
There're parts of the API we don't intend to publish to others, but 
would like to maintain documentation on the entire interface.

Thoughts?  Suggestions?  FOSS is good but not a requirement.

Thanks!
-Brian