Abstract: A method of distributing software objects from a first entity to at least one second entity, the method comprising: using a distribution entity to accept a software object from the first entity, the software object including an identifier for a specific second entity, and wherein the at least one second entity is operable to contact the distribution entity and to enquire if a software object has been deposited for it, and if a software object has been deposited, to accept it from the distribution entity.

Abstract: A security system for controlling access to encrypted information, comprising: a memory for storing at least one decryption key for use in decrypting an encrypted item of information, the decryption key being associated with a security code which can be used to determine whether the security system is authorized to send encrypted copies of the decryption key to others. If the security system is authorized to send an encrypted copy of the decryption key, it encrypts the decryption key and propagates the encrypted copy of the decryption key. Each time the security system propagates a decryption key, it includes as part of the decryption key an identifier indicating the identity of a sender's key. A user can append a control word against their identity in the decryption key to instruct the security system to initiate a message to them or an agent informing them of the propagation of the key and giving information concerning that propagation.

Abstract: A security system for controlling access to encrypted information, comprising: a memory for storing at least one decryption key for use in decrypting an encrypted item of information, the decryption key being associated with a security code which can be used to determine whether the security system is authorised to send encrypted copies of the decryption key to others. If the security system is authorized to send an encrypted copy of the decryption key, it encrypts the decryption key and propagates the encrypted copy of the decryption key. Each time the security system propagates a decryption key, it includes as part of the decryption key an identifier indicating the identity of a sender's key. A user can append a control word against their identity in the decryption key to instruct the security system to initiate a message to them or an agent informing them of the propagation of the key and giving information concerning that propagation.

Abstract: An apparatus for and method of controlling propagation of decryption keys is provided. One embodiment of the present invention includes an encryption key propagation control system wherein a generation number is identified with each decryption key and the generation number is queried each time a request is made to forward the decryption key to another user. The generation number is decremented at each request, and once it reaches zero, further requests are refused by the control system.