Patent ID: 8239955

Claim:
A method of adjusting a security level of a removable medium, comprising: receiving a unique identification (ID) of a removable medium, a name of a file being processed, and a requested operation; determining the security level of the removable medium; determining a security level of the file being processed; and one of increasing and decreasing the security level of the removable medium based on the security level of the file being processed, wherein the one of increasing and decreasing the security level of the removable medium comprises: checking the requested operation; comparing the determined security level of the removable medium to the security level of the file being processed, if the requested operation comprises writing the file being processed to the removable medium; increasing the security level of the removable medium if the determined level of the file being written to the removable medium is greater than the determined security level of the of the removable medium, and if the requested operation comprises writing the file to be processed to the removable medium; comparing the determined security level of the file being processed to a security level of all other files stored in the removable medium, if the requested operation comprises deleting the file to be processed from the removable medium; decreasing the security level of the removable medium if the determined security level of the file to be deleted is greater than the security level of all other files stored in the removable medium, if the requested operation comprises deleting the file to be processed from the removable medium; updating a table mapping the security level of the removable medium to a security zone if the determined security level of the removable medium is one of increased and decreased; and allowing or preventing transportation of the removable medium inside or outside of a security zone.