Who is allowed to issue a warning letter in trademark law?
Authority of the trademark owner to issue a warning letter
"Popular actions," i.e., the assertion of third-party interests in one's own name, are very rare in German civil law. Whether someone can assert claims for trademark infringement is a question of active legitimacy. In trademark law, at any rate, only the owners of their own original or derived rights may issue a warning notice. The owner of a trademark has the right of action against the trademark infringer without further ado.
Legitimation to sue of trademark licensees
The exclusive and the simple licensee of a German trademark has the right to sue for cease-and-desist, but not for damages. This is because they do not have their own claim for damages or their own claim for information against the infringer which prepares the ground for damages ("accessory") (BGH of July 19, 2007, I ZR 93/04 - Windsor Estate, para. 32). The same applies to the licensee of an EU trademark (see BGH v. 13.9.2007, I ZR 33/05 - THE HOME STORE, para. 46). Therefore, a licensee may claim injunctive relief in a warning letter, but not payment of damages to himself.
Information and damage calculation options in the event of trademark infringement
Usually, the injured party calculates his damages according to the license analogy or he calculates the infringer's profit. For this purpose, he needs the infringer's information. The person issuing the warning notice must specify here the actions for which he is requesting information. If he also requests invoicing, he must specify which invoices are to be submitted. If the infringed party only demands compensation for his own concrete damage, no information must be provided. This is because the infringed party can quantify this damage himself.
Only when the person being warned has provided information about the extent of the infringement can he calculate his damages. Like the claim for damages, the claim for information only exists in the event of a culpable infringement of the law by the person being warned.
How detailed must information be provided?
In principle, the infringer must provide information about all infringements complained of. Since the decision of the German Federal Court of Justice (BGH) of July 19, 2007, Case No. I ZR 93/04 - Windsor Estate, there is no longer a time limit from the first proven infringement (see also German Federal Court of Justice decision of April 30, 2009, Case No. I ZR 191/05 - Electronic Customs Tariff). The warning party must also generally disclose its upstream suppliers and its commercial customers. This information is often particularly interesting for the person issuing the warning. In this way, he can work his way step by step to the manufacturer of a plagiarism, for example. The subsequent warning of other links in the supplier chain often increases the willingness to reach an out-of-court settlement.
As a matter of principle, the warned party must also submit invoices and other customary documents about its income and expenses relating to the infringing products. How detailed the warned party must submit invoices depends on the individual case, in particular also on the type of company of the infringer. For example, a pure distribution company - unlike the manufacturer of a plagiarism - usually does not have to provide information on manufacturing costs.
TIP: In order to avoid the warning party having to disclose its customers to the warning party, which is at the same time its competitor, the warning party can claim a so-called "auditor's reservation".
Finally, the scope of the information also depends on the way in which the infringed party wishes to calculate its damages. In addition, confidentiality interests and the principle of proportionality limit the scope of the right to information (BGH v. 6.10.2005, I ZR 322/02 - Noblesse, para. 14).
In the case of so-called "third-party information", in the event of an obvious infringement of the law or after a lawsuit has been filed, forwarding agents, warehousing companies or the operators of online platforms, for example, may also be obliged to provide information.
Which information do not have to be disclosed?
Anyone who has committed a trademark infringement does not have to provide information about the advertising media or the number of clicks on an infringing advertisement for the independent claim to information. This is because this information is not mentioned in Section 19 (3) of the German Trademark Act (BGH v. 14.07.2022 - I ZR 121/21 - Google Drittauskunft). However, this information may have to be provided for the accessory claim for information that prepares the claim for damages.
What happens in the case of false information about the trademark infringement?
If the injured party can prove that the infringer provided false information, he can have the infringer forced to provide information again and to affirm the accuracy of his information in lieu of an oath. Providing false information again would then be punishable by law.
Counter warning as a "tit-for-tat" response
Lawyers occasionally recommend investigating the sender of a warning notice for infringing behavior themselves, for example by "fleeing" their website. However, some courts consider a subsequent counter-warning as a "return payment" in order to subsequently be able to offset the claims for reimbursement of costs to be an abuse of rights (e.g. LG München I, BeckRS 2008, 10678). However, the Federal Court of Justice does not consider a "return payment" to be an abuse of rights per se.