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jneves

It's not conditional. The police and city hall can't say no. You're just suppose to inform them of the protest. Have done this a few times in Portugal.
If you wish, you can follow the daily statistics of the Portuguese grid at: http://www.centrodeinformacao.ren.pt/PT/Paginas/CIHomePage.a... (in Portuguese) or http://www.centrodeinformacao.ren.pt/EN/Pages/CIHomePage.asp... (in English).
There's no incentive not to sell (by the contrary), meaning there's no long term ownership, which means that the system just temporarily avoids the financial incentives to pump-and-dump, doesn't remove them.