You must replicate using wget the same actions as in a web browser. The first step is to see what HTTP requests are executed when you request a license page, and a confirmation button.
You can use firebug or livehttpheaders for this . When you have the urls (with post / get param options), you can reproduce it with a shell script and several wget calls.
If the website is tracking cookies, you need to instruct wget to save them in the cookiejar and use the specified cookiejar for further requests.
In your case, the first request
GET /oneiric/lt-origen-oneiric/20120321/0/images/hwpack/hwpack_linaro-lt-origen_20120321-0_armel_supported.tar.gz HTTP/1.1
for which you receive a cookie and redirect
Set-Cookie: downloadrequested=/oneiric/lt-origen-oneiric/20120321/0/images/hwpack/hwpack_linaro-lt-origen_20120321-0_armel_supported.tar.gz; path=/; domain=.snapshots.linaro.org
Location: http://snapshots.linaro.org/licenses/samsung-v2.html
when you press the confirmation button
GET /licenses/samsung-accepted.html HTTP/1.1
cookie ( )
Set-Cookie: samsunglicenseaccepted-v1=true; path=/oneiric/lt-origen-oneiric/20120321/0/images/hwpack/; domain=.snapshots.linaro.org; expires=Wed, 21-Mar-2012 17:37:57 GMT
Location: http: