5 In addition, a request for preservation may only be refused if: a the request concerns an offence which the requested Party considers a political offence or an offence connected with a political offence, or b the requested Party considers that execution of the request is likely to prejudice its sovereignty, security, ordre public or other essential interests. 6 Where the requested Party believes that preservation will not ensure the future availability of the data or will threaten the confidentiality of or otherwise prejudice the requesting Party’s investigation, it shall promptly so inform the requesting Party, which shall then determine whether the request should nevertheless be executed. 7 Any preservation effected in response to the request referred to in paragraph 1 shall be for a period not less than sixty days, in order to enable the requesting Party to submit a request for the search or similar access, seizure or similar securing, or disclosure of the data. Following the receipt of such a request, the data shall continue to be preserved pending a decision on that request. Article 30 – Expedited disclosure of preserved traffic data 1 Where, in the course of the execution of a request made pursuant to Article 29 to preserve traffic data concerning a specific communication, the requested Party discovers that a service provider in another State was involved in the transmission of the communication, the requested Party shall expeditiously disclose to the requesting Party a sufficient amount of traffic data to identify that service provider and the path through which the communication was transmitted. 2 Disclosure of traffic data under paragraph 1 may only be withheld if: a the request concerns an offence which the requested Party considers a political offence or an offence connected with a political offence; or b the requested Party considers that execution of the request is likely to prejudice its sovereignty, security, ordre public or other essential interests. Title 2 – Mutual assistance regarding investigative powers Article 31 – computer data 1 Mutual assistance regarding accessing of stored A Party may request another Party to search or similarly access, seize or similarly secure, and disclose data stored by means of a computer system 54