The questions about extended documents

Hi!
I have several questions about PDF form.
In Acrobatusers.com, I have read the following posts;
1. Easily create electronic forms
http://acrobatusers.com/tutorials/easily-create-electronic-forms
2. More Enabiling Features for Adobe Reader
http://www.acrobatusers.com/articles/2006/09/enabling_reader

The first post shows briefly how to creat PDF form. Then, I can figure out that Adobe Acrobat can define and make form field, check box, etc. in PDF file (with form layout).
And from second post, I also found that "more enabiling feature for Adobe Reader" of Adobe Acrobat allows the users to save a PDF form file locally after typing in form field or selceting any check box of the form PDF, etc. by using Adobe Reader. Also this issue seems to have a connection to topic "Forms>Distribute Form" command. I think this is very powerful function that Adobe Acrobat 9 provides. But, the second post also described that enabling function can be for only 500 Adobe Reader users.

So I have checked EULA of Adobe Acrobat 9 as describe in the second post "2. More Enabiling Features for Adobe Reader" and there are a definiction of "Extended document" and its usage restrictions as related terms in EULA.

From these, serveral questions has occurred to me.
1. What is the scope of "extended document"? That is, withoug using "2. more enabiling features for
Adobe Reader", is the PDF form described in "1. Easily create electronic forms" also "extended document"?
2. Whatever "the PDF form created by Adobe Acrobat" is used for, is the PDF file under the restriction of 500 users limitation described in the above second post and EULA term 15.12.1.2 & 15.12.3 of Acrobat 9? That is, even if the PDF file is not enabled for Adobe Reader and so the PDF file can not be saved locally in Adobe Reader, is still this PDF file under the restriction of EULA term 15.12.1.2 & 15.12.3 of Acrobat 9?