4.2. Probative value of evidence on a case-by-case basis

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1. There is only one standard of proof in the proceedings before the EPO: the deciding body, taking into account the circumstances of the case and the relevant evidence before it, must be convinced that the alleged fact has occurred (see point 1.2.1 of the Reasons). 2. The boards have the power, at any stage of the appeal proceedings, to establish the relevant facts of the case before them and thereby substitute the findings of fact of the departments of first instance. However, the boards have no obligation to establish facts de novo already established by the departments of first instance (see point 1.2.4 of the Reasons). 3. The board's review of a fact-finding process should not be conflated with the review of discretionary decisions within the meaning of the obiter dictum in G 7/93, Reasons 2.6 (see point 1.2.4 (a) of the Reasons).

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When a video retrieved from the internet is used as prior-art evidence for refusing a patent application, its content, in a form suitable for reviewing the decision, and metadata evidence demonstrating when and how it was made available to the public should be preserved and made accessible over time to interested parties and judicial bodies

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1. A boards' power to review appealed decisions is not limited to points of law but extends to points of facts (in agreement with T 1604/16).  2. However, it is settled case law that a board is not obliged to take all the evidence anew and that parties do not have the right to have the taking of evidence repeated at their request before the board. 3. The principle of free evaluation of evidence, meaning that there are no firm rules on the probative value of the various types of evidence but that the deciding body is entrusted with weighing up all the evidence and basing its decision on what it is then satisfied has been established, implies a degree of freedom comparable to the one referred to by the Enlarged Board of Appeal in decision G 7/93, Reasons 2.6.  4. Thus, it is wise to similarly respect this freedom, especially when taking into account that a board, except when only reviewing documentary evidence, does not have the same first-hand impression of the probative value of a means of evidence as a department of first instance that has itself heard a witness or expert or inspected an object.  5. Although the Board is not limited in its decision, it normally seems useful to apply the test set out in decision T 1418/17, Reasons 1.3: Unless the law has been misapplied (e.g. application of the wrong standard of proof), a board of appeal should overrule a department of first instance's evaluation of evidence and replace it with its own only if it is apparent from that department's evaluation that it: (i) disregarded essential points, (ii) also considered irrelevant matters or (iii) violated the laws of thought, for instance in the form of logical errors and contradictions in its reasoning.  6. The evaluation of evidence only refers to establishing whether an alleged fact has been proven to the satisfaction of the deciding body. The discretion-like freedom is restricted to this question and does not extend to the further question of how the established facts are to be interpreted and what the legal consequences are.  (see Reasons 3.2 to 3.6).