Quoted from http://www.obdev.at/products/littlesnitch/download.html:
Little Snitch offers a free, built-in demo mode that provides the same protection and functionality as the full version. The demo runs for three hours, and it can be restarted as often as you like. The Network Monitor expires after 30 days.
Make caveats a first-class member of the Cask DSL. It no longer has to
be specified with "def caveats", but can be given as "caveats do ... end"
as with after_install blocks.
In addition, create a mini-DSL which can be used within caveats blocks,
providing standard messages when manual installers must be used,
reboot-required, etc.
Add alternate form: caveats can also accept a compile-time string for
simple cases.
This is 99% compatible with old Casks, as it still works by defining
a caveats method. However, all Casks containing caveats are cleaned
up and adapted according to the new DSL.
Full docs in CONTRIBUTING.md.
`md5`, `sha1`, `sha256` all take a hexdigest string, e.g:
sha1 'f645e9da45a621415a07a7492c45923b1a1fd4d4'
`no_checksum` takes no argument, and indicates there is no checksum
for this cask. This is *not recommended*, and should only be used for
casks that have no versioned downloads.
`brew cask install` will complain if there is no sum provided (unless
`no_checksum` has been invoked), or if the sums do not match. It will
provide the computed checksum so the cask can be easily amended.
Adapted from @passcod's work in 82cc199ae6
Koen Rouwhorst