You are an Adland alumni. For the price of a fancy latte a month you get access to job boards & forums, the ability to add your own work to the archive as a portfolio, and you see the site without those annoying banner ads stalking your every move.
If you send work to Adland you accept that Adland is then free to display the work on the website for eternity. Adland accepts submissions of work on the understanding that that submitter of the work is entitled to do so. Any spec work should be marked as such - if it's good, we'll show it. Responsibility for any offence caused to either agency or client lies with the person submitting the work.
All members can post their own work as well (radio is very easy to do).
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See also the full copyright notice and terms of service page