DropDMG automatically saves licenses and layouts in its folder in Application Support. You may, however, wish to share your licenses and layouts with other users. This is especially useful if you want to keep them under a version control system such as Subversion or Git.
To export a license, drag it from the source list to the Finder. This will create a folder containing a .plist file and a .rtf file for each language.
To export a layout, drag it from the source list to the Finder. This will create a folder containing an Info.plist, the background image file, etc.
When creating a disk image using the dropdmg command-line tool, you can specify detached licenses or layouts using the --license-folder and --layout-folder parameters. Corresponding parameters are available for AppleScript.