Thats just stupid, if people REALLY want their libraries safe from hackers they should release them. Once it's online it's pretty much free game so long as it's not being used for illegal purposes.
On a lighter note I just wrote a library cleaner (which will be part of my library by default from now on).
What this does it it removes all unnecessary arguments (the default count is 8 even though the max is 6 [go figure]).
Replaces the bitmaps of Labels, Place Holders, and Separators with an empty 1x1 24bit image (this is the major hit on file size).
The final thing it does is remove the menu items of anything that is NOT a menu (cutting down size a little more).
Here is a side by side comparison of the file sizes before and after:

and here is 01_move.lib inside extmaker showing off it's lack of bitmap tile:

and finally the actual program that does this witchcraft:
Download
here (uploaded to a better host)
EDIT:
Here is the header spec for the libraries.
int FileVersion;
int NameLength;
char Name[NameLength];
int LibraryId; // < 1000 is official
To further prove the point I made in my previous post, the id of ALL official libraries is 1.
Edited by antidote, 03 June 2010 - 05:27 PM.