|European Case Law Identifier:||ECLI:EP:BA:2012:T194308.20120125|
|Date of decision:||25 January 2012|
|Case number:||T 1943/08|
|IPC class:||G06F 1/00|
|Language of proceedings:||EN|
|Download and more information:||
|Title of application:||System and method for using location identity to control access to digital information|
|Applicant name:||GeoCodex LLC|
|Relevant legal provisions:||
Summary of Facts and Submissions
I. The appeal lies against the decision of the examining di vision, dispatched on 16 May 2008, to refuse European patent application no. 01991039.7 for lack of an inven tive step, Article 56 EPC 1973, in view of the follow ing documents:
D1: EP 0 997 808 A2
D2: US 5 640 452 A
II. Notice of appeal against this decision was received on 10 July 2008. The appeal fee was paid on 11 July 2008 and a statement of grounds of appeal was received on 16 September 2008. In the grounds of appeal, a new do cu ment was referred to:
D3: US 4 418 425 A
III. The appellant requests that the decision be set aside and that a patent be granted based on the main or first auxilia ry request that were subject to the decision. The auxiliary request was not filed in writing. In stead its claim 1 was specified orally as the combi na tion of claims 1 and 14 of the main request (cf. mi nutes of oral proceedings, point 2).
IV. The appellant also requests that the appeal fee be re funded due to an alleged substantial procedural viola tion. The appellant challenges the decision under appeal for arguing lack of inventive step based on a summary of D3 contained in D2 and without reference to D3 itself. Thereby, so the argument, the examining di vi sion had deliberately and knowingly misinter preted D2 in breach of good faith which would amount to a sub stantial procedural vio lation and justify reimburse ment of the appeal fee.
V. Claim 1 according to the main request reads as follows.
"A method for controlling access to digital information (130), comprising:
generating a location identity attribute (140) that defines at least a specific geographic location and an area parameter (143) defining a region that encompasses said specific geographic location;
combining said area parameter with said location identity attribute to yield an encryption key (170);
encrypting said digital information using said encryption key, wherein said digital information can be accessed from said encrypted digital information (314) only at said specific geographic location; and
enforcing said location identity attribute by allowing access to said digital information from said encrypted digital information only at said specific geographic location, wherein said enforcing step further comprises identifying the location of an appliance through which access to said digital information is sought and comparing said appliance location to said specific geographic location defined by said location identity attribute, and allowing decryption of said digital information only if said appliance location fails within said specific geographic location."
Claim 14 according to the main request reads as follows:
"The method of Claim 1, wherein said enforcing step fur ther comprises generating a decryption key based at least in part on said specific geographic location, said decryption key being thereby used to decrypt said digital information."
Claim 1 according to the auxiliary request is, by definition as the "combination of claims 1 and 14" of the main request, identical in scope with claim 14 of the main request which includes by reference all the fea tures of claim 1.
VI. In an annex to the summons to oral proceedings the board informed the appellant as to how it interpreted its requests. Fur thermore the board expressed its preliminary opinion that the application infringed both Articles 83 and 84 EPC 1973, that the claimed invention lacked an inventive step over D1 in combination with either D2 or D3, and that the request that the appeal fee be refunded would have to be refused.
VII. In response, the appellant did not file any substantive arguments or any amendments but in di cated its intention not to attend the oral pro cee dings.
VIII. Oral proceedings were held as scheduled. At the end of the oral proceedings the chairman announced the deci sion of the board.
Reasons for the Decision
Appellant's absence at Oral Proceedings
1. The duly summoned appellant did not attend the oral proceedings. In accordance with Article 15(3) RPBA the board relied for its decision only on the appellant's written sub missions. The board was in a position to decide at the con clusion of the oral proceedings, since the case was ready for decision (Article 15(5,6) RPBA), and the vo lun tary absence of the appellant was not a reason for delaying the decision (Article 15(3) RPBA).
2. The following reasons are based on the board's preli mi nary opinion annexed to the summons to oral proceedings.
3. The invention is concerned with limiting access to digi tal information to appliances at a specific, pre-defined geo gra phical loca tion. More specifically, the description pro poses to encrypt the information with a key which is based, "at least in part", on the geo graphic location at which access should be allowed. The appli ance desiring access will generate a decryption key inter alia from its loca tion in such a way that the de cryption key matches the encryption key only if the appliance location is within the allowed region (see description, page 5, lines 20-22; page 15, lines 13-15; page 16, lines 19-23).
Article 84 EPC 1973
4. The independent claims of both requests - i.e. claims 1 and 22 of the main request and at least claim 1 of the auxiliary request - lack cla ri ty and support for a number of reasons, contrary to Article 84 EPC 1973.
4.1 The independent claims of both requests specify the ge ne ration of a "location identity attribute (140) that de fines ... a specific geographic location" and, sepa ra te ly, of an "area parameter (143) de fining a region that encompasses said specific geogra phic location". In the description it is disclosed that the "location iden ti ty attribute" comprises two items of information, namely a location value and a proximity value, and that the "area parameter" may correspond to the "proximity value" (cf. fig. 2; page 9, lines 22-23; page 15, lines 25-26). This would appear to mean that the area para me ter alone can not define a region encom passing the geo gra phic location but rather only its extent (cf. page 9, lines 28-29).
4.2 The independent claims of both requests further specify that an appliance seeking access to digital information will compare its own location to the "geographic loca tion defined by said location identity attribute". In the board's view this implicitly requires that "said lo cation identity attribute" - in total or in part - is available to the appliance even though the claims do not explicitly specify this fact.
4.3 The description does not disclose anywhere that the entire "specific geographic location defined by said location identity attribute" is stored with the digital information and hence does not support this information being available to the appliance for the claimed comparison. This is in conflict with claim 14 of the main request and claim 1 of the auxiliary request which specify the generation of a decryption key "based at least in part on said specific geographic location".
4.4 The description does disclose however that the area para meter is attached to the digital information in clear text form (page 16, lines 3-4) which makes it avai lable to the appliance. The board considers this to be an essential feature missing from the claimed invention.
4.5 The independent claims of both requests specify that the area parameter and the location identity attribute are combined to yield an encryption key without speci fying any detail about how this is meant to be done. The same applies to claim 1 of the auxiliary request insofar as it specifies that a decryption key be generated but does not specify how this is done, let alone in such a manner that both keys would match.
4.6 In the board's view these are also essen tial features of the invention missing from the claims, inter alia because they are the only ones which could explain how the claimed result of "allowing access ... only at said specific geographic location" is achieved.
4.7 Where the independent claims specify that access should be allowed only "at said specific geogra phic location" (see e.g. claim 1, claims page, line 10), which is defined by the "location iden tity attribute", rather than, less stringently, only within the region defined by the area parameter it is unclear what role the area parameter plays in the claimed invention.
Article 83 EPC 1973
5. The board also finds that the invention is not disclosed in a manner sufficiently clear and comp lete for it to be carried out by a person skilled in the art, contrary to Article 83 EPC 1973.
6. The description does not disclose any specific example of how encryption and decryption keys are to be gene ra ted, neither based on the location identity attribute and the area parameter as claimed, nor from geographic location information in more general terms. This con sti tutes a violation of Rule 27(1)(e) EPC 1973 which requires that the description disclose in detail at least one way of carrying out the invention.
7. The board furthermore considers that it is not evident for the skilled person how to carry out the invention as claimed without such a detailed description for the following reasons.
7.1 The board concedes that the skilled person would know at least one way of generating a key from geo gra phic lo ca tion information, for instance by using the geo gra phic coordinates themselves as the key. This would work, in principle, at least for symmetric cryptography in which the encryption and decryption keys are the same: an appliance at precisely the location from which the encryption key was generated would be able to regene rate the key from its location alone. It is not evident however how this would work when the appliance location differed from the location used for encryption.
7.2 An appliance could also regenerate the decryption key if the original location were attached to the digital in formation in cleartext. Obviously this would defeat the purpose of the invention because the digital infor mation could then be accessed indepen dently of the appli ance location. The description con cedes this by disclosing that only the area para meter is attached to the digital infor ma tion and that it should be im possible to generate the key from the area information alone but possible to ge nerate it in combina tion with the appliance location (see page 16, lines 3-7).
7.3 Typically, the appliance location will be different from the location used for encryption. Hence generation of the encryption key must be based on diffe rent infor ma tion than generation of the decryption key. How this is possible is, in the board's view, not evident. In fact, the board is of this opinion for the simpler case of symmetric cryptography and - even more so - for asym metric (i.e. public key) cryp to graphy to which the inven tion "could be adapted" as the description men tions in passing but without any further explanation (page 16, lines 25-28). It is nowhere disclosed in the description how geo gra phic information could be inte gra ted into the key ge neration for public key crypto graphy.
7.4 The deficient disclosure of the application may be illustrated by way of the following two examples.
Example 1: Imagine that certain digital information should be accessible in a region defined by a circle of 50 km around the centre of Munich (cf. page 10, lines 26-27). The encryption key would hence be generated by the coor dinates of the centre of Munich and the area in formation defi ning a circular region around it. To allow access in, say, the town of Freising it must be estab lished that Freising lies within 50 km of the centre of Munich (which is the case). In this scenario, both keys may be generated from the same region infor ma tion, but it is not clear how the calcu lation of the decryption key should take into account the spe ci fic geo gra phic location (e.g. the coordinates) of Frei sing as the appliance location.
Example 2: Imagine that digital information is encryp ted in Brasilia and should be accessible anywhere in Bra zil (cf. page 11, lines 2-3). To allow access in Rio de Janeiro it would be necessary to establish that Rio lies in Brazil. If the coordinates of Brasilia had been used for encryption, it would seem that the appliance should be able to look up the coordinates of Brasilia when given those of Rio. If they were not used, it would appear sufficient if the appliance could obtain the information that Rio lies in Brazil. In either case the precise geographical location of Rio de Janeiro appears irrelevant for decryption.
The board is therefore of the opinion that the de scrip tion does not sufficiently disclose the gene ra tion of the relevant keys in such a way that their generation is not only based on the "area information" but also, as claimed, based on the location identity attribute.
Reimbursement of the Appeal Fee
8. Rule 103(1)a) EPC provides that the appeal fee shall be reimbursed where the board deems an appeal allowable, if such reimbursement is equitable by reason of a substantial procedural violation.
9. Since this appeal is not allowable already the precondition for reimbursement is not fulfilled.
10. Beyond that, the board would like to underline that it cannot find any indication that the examining division has committed a substantial proce dur al violation.
10.1 The board agrees with the appellant that the precise dis closure of D2 may be open to debate, and whether or to what extent the disclosure of D2 can be appreciated on the basis of D2 alone or whether rather D2 can only be properly in ter pre ted in view of D3.
10.2 This however is matter of fact rather than one of pro ce dure. Therefore, even if the board were to disagree with the inventive step objection in the decision, this would not constitute a procedural violation (see inter alia T 465/97, not pub lished in OJ EPO, reasons 220.127.116.11).
10.3 Apparently, the examining division did come to their con clu sion "knowingly" and "deliberately". However they came to their conclusion after having discussed it with the applicant (see minutes of oral procee dings, points 3.3 and 3.4) and thus not in an arbitrary manner. There fore the board does not find that the behaviour of the examining division constitutes the breach of "good faith" alleged by the appellant.
10.4 The board concludes that the re quest to reimburse the appeal fee must be refused.
For these reasons it is decided that:
1. The appeal is dismissed.
2. The reimbursement of the appeal fee is refused.