Abstract: Mixed-media data, such as that including animation data (801), model data (802) and texture data (803) along with other media data types is encoded. To prevent unauthorized access. The data types are combined to produce a mixed-media data file (805). Passwords are added to produce an internal file with passwords (1103). A file key (1202) is combined with a program key (1203) to produce an encryption key (1204). The encryption key is used to encrypt the internal file (1103) to produce an encrypted internal file (1302). The file key (1202) is added to the encrypted internal file as part of a header to produce a coded export file (1401). In this way, a plurality of access keys may exist each providing different levels of access to a user.

Abstract: Encrypted mixed media data (201) may be read by many browsers (101) from a server (108). Downloaded encrypted environment data includes data modification access codes. A user access code is received and an access check (214) is performed against the decrypted environment data (213). The user access code is processed in combination with the data modification access codes to determine an extent to which a user is permitted to view, modify or interact with the environment data under the control of a data modification process (215). Animation data (202 to 209) is received and animation data is rendered (217) whereafter the rendered data is displayed (218).

Abstract: Mixed-media data, such as that including animation data (801), model data (802) and texture data (803) along with other media data types is encoded. To prevent unauthorized access. The data types are combined to produce a mixed-media data file (805). Passwords are added to produce an internal file with passwords (1103). A file key (1202) is combined with a program key (1203) to produce an encryption key (1204). The encryption key is used to encrypt the internal file (1103) to produce an encrypted internal file (1302). The file key (1202) is added to the encrypted internal file as part of a header to produce a coded export file (1401). In this way, a plurality of access keys may exist each providing different levels of access to a user.

Abstract: Encrypted mixed media data (201) may be read by many browsers (101) from a server (108). Downloaded encrypted environment data includes data modification access codes. A user access code is received and an access check (214) is performed against the decrypted environment data (213). The user access code is processed in combination with the data modification access codes to determine an extent to which a user is permitted to view, modify or interact with the environment data under the control of a data modification process (215). Animation data (202 to 209) is received and animation data is rendered (217) whereafter the rendered data is displayed (218).