Need guidance entering my own data in a PDF file

Please refer to this example:
http://www.gnupdf.org/Introduction_to_PDF
I am trying to teach myself PDF internals. My immediate objective is to save some private data in my PDF files. My data is structured as "variable/value" pairs but I chose not to save it as custom properties because of its bulk and the possibility of confusion and undesired manipulation by the end user.
The above example immediately suggests that I should use an object of "dictionary" type. Let's try to assemble the file manually:
44 0 obj
<<
(Favorite Baseball Team) (Boston Red Sox)
(Age) (35)
(Planet of Birth) (Klingon)
>>
endobj
Is the above initial attempt correct? I will of course use the corresponding API to create the dictionary, but I am concerned about breaking things. Won't Acrobat get confused when it finds this foreign stuff?
TIA,
-Ramon

Hi Leonard,
Thanks for your always valuable help. FYI, my data is of a global nature. I suppose I should come up with some unique name ("MyPrivateData" or something) and place such entry in the Catalog?
This thread brings up a related topic. It is about the uniqueness of the JavaScript namespace. My PDF files are generated automatically and JavaScript code is added to them. I haven't done any tests yet, but I foresee the following problem: those generated PDF files may end up being merged with each other which brings the potential of namespace conflicts.
Let's say that the first JS-laden document has 3 pages and another one has 2 pages. I suppose there is no way to restrict it like: "this JS code applies to the first 3 pages only". As soon as the 2 documents are merged all the JS code (and worst of all: the variable and function names) applies to the 5 combined pages, correct?
There are 2 possible solutions:
- Perhaps there is a way to declare some JS code as belonging to one page only?
- Use collections. This brings a whole new layer of complexity and expense.
Thanks again,
-Ramon

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Need guidance entering my own data in a PDF file

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