264.This section explains the effect of serving a notice imposing a disclosure requirement in various circumstances.
265.Subsection (1) applies where a person has, at the time a notice is served, possession of the relevant protected information and a means of accessing it and of disclosing it in an intelligible form. This means that they have the password, in the case of material protected by a password; or the decryption key in the case of encrypted material; or both, in the case of material protected in both ways. In these circumstances, the effect of imposing a disclosure requirement is, first, that the recipient of a notice may use any key in their possession to access the information or to put it into intelligible form; and, second, that they must disclose it in accordance with the terms of the notice.
266.Subsection (2) allows a person who is required to disclosure information in an intelligible form to instead disclose a relevant key if they so choose to do so.
267.The effect ofSubsection (3) is that where a notice is served on a person who does not have the relevant protected information in their possession; or cannot access the information without use of a key which is not in their possession; or the notice contains a direction that a key must be disclosed (as to which, see section 51), that person must disclose any key to the information that is in their possession at a relevant time. But this duty is qualified by subsections (4) to (6).
268.The Act does not prevent the person giving a section 49 notice from giving the recipient access to the protected information, in order to allow then to produce plain text rather than disclose a key.
Other Authorisations Part Iii:  Investigation of Electronic Data Protected by Encryption Etc Section 50: Effect of notice imposing disclosure requirement