T 0768/17 (Authenticating wireless payments/VODAFONE) 26-01-2023

1. Admittance

1.1 Auxiliary requests 1 to 5

The Board admits the first to fifth auxiliary requests into the proceedings under Article 13(2) RPBA 2020. The reason is that these requests are a bona fide attempt to resolve issues under Articles 84 and 123(2) EPC raised by the Board for the first time. Also the amendments made are minor and do not present the Board with any new complex issues.

1.2 The Board does not admit the main request filed during the oral proceedings into the proceedings for the following reasons.

Firstly, claim 1 of this request contains extensive amendments based on the description and the Board cannot see an exceptional circumstance in the sense of Article 13(2) RPBA 2020 which would justify making such amendments at an advanced stage of the proceedings. This is all the more so considering that the objection of lack of inventive step, which the amendments seek to overcome, was raised in the contested decision and expanded in the Board's two communications. Accordingly, the appellant had ample opportunity to introduce these amendments earlier.

Secondly, contrary to the appellant's view (see section XV above), it is not prima facie clear and would have to be carefully examined whether the amendments indeed overcome the objection under Article 56 EPC and do not give rise to new issues. Conducting such examination at an advanced procedural state contradicts the need for procedural economy laid down in Article 13(1) RPBA 2020.

2. Since the new main request replacing the previous main request was not admitted, the Board has to only decide on the auxiliary requests filed with a letter dated 28 November 2022.

3. The invention

3.1 The invention concerns the authentication of a wireless payment transaction at a point of sale (POS) (see published application, paragraphs [6] and [7]).

3.2 Looking at Figure 3, the core idea is to receive independently information about a payment transaction from the POS's reader device (120 - "first information about the transaction" in the claims) and a customer's mobile communication device (110 - "second information about the transaction") and to accept the transaction only if those information items "coincide within certain limits", see [12] and [16]. This effectively means that the transaction is rejected if the mobile device and the POS terminal provide inconsistent information about it.

3.3 Payments are conducted using a payment identifier which the mobile communication device receives from a backend system (105). While not claimed, but disclosed in the application, the identifier may be for example an IBAN, see [5] and [38].

In order to carry out a payment at the POS, the mobile communication device wirelessly transfers the identifier, stored in a secure element (115), to the reader device ([6]) along with the first information about the transaction ([12] and [13]). The reader device forwards the received data to the backend system, which is entrusted with the transaction authentication, via a first communication channel. Additionally, the mobile device prepares the second information about the transaction and sends it to the backend system via a second wireless communication channel, see [12], [16], [25] and [28].

The backend system compares the first and second information and if they coincide within certain limits ([16]), it instructs a bank system to effect the payment ([40]).

4. Fifth auxiliary request, Article 56 EPC

4.1 The Board finds it efficient to analyse the most specific fifth auxiliary request first.

4.2 It is common ground that D1 is the closest prior art. Using the wording of claim 1, D1 discloses (claim wording in italics; references to D1 and the Board's comments in brackets):

A system comprising a mobile communication device (page 6, line 4: an NFC-enabled mobile device) and a backend system (page 5, lines 15 to 17: a merchant server),

wherein the mobile communication device (110) comprises

a radio interface (112) for receiving at least a part of an identifier provided by means of a backend system (page 8, lines 26 to 30 and page 10, lines 4 to 9: a softcard's personalisation data is sent wirelessly from the merchant server to the NFC-enabled mobile device);

a secure element (115) being adapted to store the transmitted identifier (page 10, lines 10 to 11);

a processor for preparing a transaction to a reader device (120) by means of at least a part of the transmitted identifier and first information about the transaction and a transaction interface (116) for transferring at least the part of the transmitted identifier and first information about the transaction to a reader device (120) for starting the transaction (page 10, lines 25 to 30: transmission of the softcard personalisation data and further information concerning card balance and payment amount to a wireless device reader (118) at the POS).

the backend system (105) comprises a backend processor (102) for generating the identifier, the backend system further comprises a backend memory (101) for storing the identifier (page 8, lines 19 to 25) and a backend interface (103) for transmitting at least a part of the identifier to the mobile communication device (page 8, lines 26 to 30 and page 10, lines 4 to 9).

Furthermore, D1 discloses a communication channel connecting the POS system to the merchant server (page 11, lines 12 to 17) which corresponds to the first communication channel in claim 1. The system of D1 uses this communication channel for validating an authorisation code provided to a non NFC-enabled mobile device. D1 discloses further an over-the-air communication channel connecting the merchant server to the mobile device (page 9, lines 9 to 11 and page 10, lines 4 to 7) which corresponds to the second wireless channel in claim 1.

4.3 The subject-matter of claim 1 differs from D1 in that (lettering added by the Board):

A) The backend interface (103) is further adapted to receive via a first communication channel a request of confirmation comprising at least the part of the identifier transferred to the reader device (120) and first information about the transaction;

B) The backend interface (103) is further adapted to receive the second information about the transaction from the mobile communication device (110) via a different second communication channel;

C) The backend processor (102) is adapted to compare the first and second information about the transaction;

D) The backend processor (102) is further adapted to authenticate the request and to prepare a confirmation to verify the identifier transferred to the reader device (120) if the comparison reveals that the first and second information coincide within certain limits;

E) The backend interface (103) is further adapted to transfer the confirmation for initiating a payment by means of a bank system, if the request is authenticated (130).

4.4 As set out above, the distinguishing features implement the idea that the transaction is accepted if the information about it provided by the customer and the POS coincide within certain limits. Like the contested decision and contrary to the appellant's view (see decision, pages 5 to 6 and section XV above), the Board judges that this is a business idea which does not involve any technical considerations. Entrusting the backend instance with authenticating transactions is a further business decision.

4.5 Accordingly, the Board judges that the distinguishing features implement a non-technical business method, wherein:

- The transaction is accepted if the first information about it received from the POS and second information about it created by the customer coincide within certain limits.

- The first and second information about the transaction are independently provided to the backend instance which performs the authentication and forwards accepted transactions to a bank for initiating a payment.

4.6 Contrary to the appellant's view, the Board cannot see that, at the level at which they are defined, the distinguishing features enable detecting transmission disturbances between the user mobile device and the reader device.

Firstly, the claim says that the first and second information are independently prepared and, in fact, covers the case that they are quite different. Secondly, the criterion that those information items coincide within certain limits covers any kind of subjective semantic similarity. Contrary to the appellant's argument, the Board cannot see how applying this broad semantic criterion credibly addresses the fact that a real-life data processing system might incur some error at a bit level.

Hence, the claim covers comparing different independently created information using a broad semantic criterion. The Board cannot see how this contributes to detecting transmission errors between the mobile device and the POS or elsewhere in the claimed system.

4.7 Furthermore, in view of the lack of detail concerning the content of the compared information and the vagueness of the comparison criterion, the Board doubts that the alleged effect of detecting a human mistake or fraudulent manipulation of transaction data is achieved over the whole scope of the claim. However, even assuming that in some cases a human mistake and manipulation could be detected, these effects would result from the aforementioned business idea and not from its technical implementation and, therefore, would not count towards an inventive step.

4.8 Furthermore, the Board disagrees that, from the technical perspective, the claimed solution is comparable to the use of checksums in order to establish integrity of electronically transmitted data. Firstly, checksum algorithms operate at a bit level and, unlike the claimed method, are not concerned with the information semantics. Secondly, a checksum is calculated on transmitted information, whereas the claimed method compares two different, independently created information items.

4.9 In line with the COMVIK principle (see T 641/00 - Two identities/COMVIK), once the aforementioned requirement specification has been provided to the skilled person within the framework of the technical problem, he would have found the claimed implementation obvious without the need for inventive skills.

4.10 Starting from D1, it would have been obvious to program the POS system to forward the information received from the mobile device to the merchant server over the communication channel connecting the merchant server and the POS.

Furthermore, it would have been obvious to adapt the NFC?enabled mobile device to create second information about the transaction. The requirement specification asking that the second information be transmitted independently of the first information translates in an obvious manner, at the technical level, to transmitting this information via a channel different from the one connecting the POS and the merchant server. Accordingly, it would have been obvious to use the wireless connection between the merchant server and the mobile device for this purpose.

Finally, it follows directly from the requirement specification that the merchant server needs to be adapted to determine whether the first and second information coincide to some extent and, if so, to provide the accepted transaction to a bank system for initiating a payment.

4.11 Contrary to the appellant's argument, the Board judges that the fact that in D1 the channel between the merchant server and the mobile device is not used for the same business purpose as in the claim and the fact that the channels of D1 are used in different embodiments would not have prevented the skilled person from adopting the above solution.

Also the appellant expressed the opinion that a skilled person would deem a second channel necessary if he was unsure of the discretion of the first channel and that a comparison would be obsolete, if both sets of information were transmitted via the same channel (see page 3, third paragraph of the letter dated 28 November 2022). The Board agrees with this point of view and concludes that the skilled person would have considered the use of a second communication channel without the need for inventive skills.

Furthermore, the use of the channels already disclosed in D1 has the evident advantage that no technical modification to the system of D1 is required.

4.12 Hence, claim 1 lacks an inventive step (Article 56 EPC).

5. First to fourth auxiliary requests

Since claim 1 of the first to fourth auxiliary requests are broader than claim 1 of the fifth auxiliary request, they lack an inventive step for the above reasons.

6. Accordingly, none of the requests fulfils the requirements of the EPC.