РАЗБЛОКИРОВАНИЕ И БЛОКИРОВАНИЕ ПРИЗНАКОВ ПРОГРАММНОГО ОБЕСПЕЧЕНИЯ

摘要

An encryption step 67 is used to obtain the feature change code to provide additional security and a decryption step 68 performs the reverse of the operation in step 67. The communication device also generates its own authorization key, step 69, using the same information and the non-reversible operation used in the authorization step 66. The calculation key is compared with the authorization key decrypted from the received unlock code to determine whether or not to implement the feature change. Independent claims are included for a device with software code and for a method and apparatus for authorizing changes in features.