4 - The preservation may also be ordered by the Polícia Judiciária, by means of an authorization from the competent judicial authority or where there is urgency or danger in delay, and in this case the provision in paragraph 4 of the preceding article shall apply. 5 - Under pain of being deemed null and void, the preservation order must indicate: a) The nature of data; b) Their origin and destination, if known; and c) The period of time over which data must be preserved, up to three months. 6 - In compliance with the preservation order, whoever holds or controls such data, namely the service provider, shall promptly preserve the data under consideration for the specified period of time, protecting and maintaining their integrity. 7 - The competent judicial authority, or the Polícia Judiciária by mean of an authorization from the former, may order the renewal of the measure for periods subject to the limit provided for in paragraph 5 c), insofar as the respective conditions of admissibility are met, up to a maximum limit of one year. 8 - Upon receiving the request for assistance referred to in paragraph 1, the judicial authority with powers to decide on the matter shall determine the preservation of data until a final decision is taken on the request. 9 - Data preserved under this article shall only be provided: a) To the competent judicial authority, to execute the request for assistance referred to in paragraph 1, as if a similar national situation were at stake, pursuant to articles 13 to 17; b) To the national authority that issued the preservation order, as if a similar national situation were at stake, pursuant to article 13. 10 - The national authority which receives, pursuant to the preceding paragraph, a communication on traffic data to identify the service provider and the path through which the communication was transmitted, shall communicate them promptly to the requesting authority, to enable that authority to submit a new request for expedite preservation of computer data. 11 - Paragraphs 1 and 2 hereof apply, duly adapted, to requests made by Portuguese authorities. Article 23 Grounds for refusal 1 - The request for expedite preservation or disclosure of computer data may be refused on the following grounds: a) Computer data under consideration concern an offence which to Portuguese Law is deemed to be a political offence or an offence connected with a political offence;