Rollback-secure accountable revocation of features
AssigneeQUALCOMM Incorporated
InventorsJoona Verneri KANNISTO, Marcel SELHORST
Life of this patent
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Abstract
Techniques and systems are provided for feature distribution. For instance, a process can include obtaining a downgrade license for a set of features for an apparatus, wherein the downgrade license enables fewer features as compared to a previous license; incrementing a non-volatile rollback counter based on the downgrade license; digitally signing the downgrade license and a value of the non-volatile rollback counter using a key to generate a digital signature; outputting the digital signature for transmission to a license server; and limiting features of the apparatus based on the downgrade license.
Claims20
An apparatus for feature distribution, the apparatus comprising:
- at least one memory;
- a non-volatile rollback counter;
- and
- at least one processor coupled to the at least one memory, the at least one processor being configured to:
- obtain a downgrade license for a set of features for the apparatus, wherein the downgrade license does not include a feature included in a previous license;
- increment the non-volatile rollback counter based on the downgrade license;
- digitally sign the downgrade license and a value of the non-volatile rollback counter using a key to generate a digital signature;
- output the digital signature for transmission to a license server;
- and
- limit features of the apparatus based on the downgrade license.
A method for feature distribution, comprising:
- obtaining a downgrade license for a set of features for an apparatus, wherein the downgrade license enables fewer features as compared to a previous license;
- incrementing a non-volatile rollback counter based on the downgrade license;
- digitally signing the downgrade license and a value of the non-volatile rollback counter using a key to generate a digital signature;
- outputting the digital signature for transmission to a license server;
- and
- limiting features of the apparatus based on the downgrade license.
Dependencies are inferred from the claim text.