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I have purchased and installed Advance Iframe pro. When I go to the setting, the security key is blank. (it says, from ver 7.5.4. this is optional). Since I would like to use the standalone version on my PHP page, whether this security key is needed. Otherwise, how it will recognise it as a legal paid version?

The security key has nothing to do if you have a paid version or not. It is there the users who don't know the security key cannot enter iframes to your page. This is interesting for users where many users have access to the page but not all should be able to use advanced iframe. As many installations allow everyone to use advanced iframe I made the security key optional because then it is easier to use.
The standalone version does not require this code as users who are able to use this have all rights on a system anyway.

Best, Michael