# US 8,752,198 B2 · Virtual write protection system

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- Number: US 8,752,198 B2
- Document ID: US8752198B2
- Status: Granted
- Kind: B2
- Application number: 11/234,483
- Filed: 2005-09-23
- Published: 2006-12-14
- Granted: 2014-06-10
- Earliest claimed: 2005-05-26
- Assignees: Hewlett-Packard Development Company, L.P.; Samsung Electronics Co., Ltd.
- Applicants: Charles R. Weirauch; Sung-hee Hwang; Kyung-geun Lee
- Inventors: Charles R. Weirauch; Sung-hee Hwang; Kyung-geun Lee
- Web page: https://patentgrep.com/patent/US8752198B2

## CPC

- G06F 12/1458: {by checking the subject access rights}
- G11B 19/04: Arrangements for preventing, inhibiting, or warning against double recording on the same blank or against other recording or reproducing malfunctions
- G11B 19/122: {involving the detection of an identification or authentication mark (record carriers indicating unauthorised or prior use G11B23/28)}
- G11B 20/00086: {Circuits for prevention of unauthorised reproduction or copying, e.g. piracy (indicating unauthorised use of record carriers in general G11B23/28; scrambling for television signal recording H04N5/913; network architectures or network protocols for network security H04L63/00; cryptographic mechanisms or cryptographic arrangements for secret or secure communication H04L9/00)}
- G11B 20/00152: {involving a password}
- G11B 20/00702: {said measures preventing that data are recorded on the recording medium}
- G11B 23/288: {Protecting disks from being written or overwritten}
- G11B 2220/215: Recordable discs
- G11B 2220/2537: Optical discs
- G06F: ELECTRIC DIGITAL DATA PROCESSING (computer systems based on specific computational models G06N)
- G11B: INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER (recording measured values in a way that does not require playback through a transducer G01D9/00; recording or playback apparatus using mechanically marked tape, e.g. punched paper tape, or using unit records, e.g. punched or magnetically marked cards G06K; transferring data from one type of record carrier to another G06K1/18; circuits for coupling output of reproducer to radio receiver H04B1/20; gramophone pick-ups or like acoustic electromechanical transducers or circuits therefor H04R)

## Abstract

An optical medium containing virtual write protect information can be recorded in drives and systems without first changing the write protection from on to off by receiving valid user input The virtual write protection may also be enabled or disabled by additional information on the disc.

## Claims

### Claim 1

A method of recording on a medium without modifying write protection on said media comprising:
collecting a write protection indicator from the medium that is loaded onto a drive;
determining whether the write protection indicator is set indicative of the medium being write protected;
based on the write protection indicator being set, determining whether a user password is required by the drive;
receiving a user password from a user if the user password is determined to be required;
verifying the user password;
based on the user password being successfully verified, collecting a virtual protection indicator from the medium;
determining whether the virtual write protect indicator on the medium is set indicative of virtual write protection for the medium;
receiving user input to allow recording to the medium if the virtual write protection indicator is set; and
recording to the medium based on the write protection indicator being set, the user password being verified, the virtual write protection indicator being set, and the user input being received.

### Claim 2 (depends on 1)

The method of claim 1 wherein the virtual protection indicator specifies, in a first state, whether to receive the user input to allow recording to the medium or, in a second state, whether a state of the write protection indicator should be changed.

### Claim 3

A drive for a recordable medium, comprising:
a controller that:
determines whether a write protection indicator is set on the medium indicative of the medium being write protected;
based on the write protection indicator being set, the controller determines whether a user password is required by the drive and receives a user password from a user if the user password is determined to be required and verifies the user password;
based on the user password being successfully verified, the controller collects a virtual protector indicator from the medium and determines whether the virtual write protection indicator is set indicative of virtual write protection for the medium;
based on the virtual write protection indicator being set, the controller receives user input to allow recording of the medium; and
causes the medium to be recorded to based on the user input being received, the write protection indicator being set, the user password being verified, and the virtual write protection indicator being set.

### Claim 4 (depends on 3)

The drive of claim 3 wherein the virtual protection indicator specifies, in a first state, whether to receive the user input to allow recording to the medium or, in a second state, whether a state of the write protection indicator should be changed.