Symbols of IP

November 21, 2024

IP symbols play a crucial role in the legal protection of intellectual creations, indicating the legal status of trademarks, patents, and protected works. Symbols like TM, C, and R are essential tools for IP rights holders, as they communicate the status of a creation or invention clearly and immediately.
In this article, we will discuss the main IP symbols and their importance in the legal protection of intellectual creations.

Symbols of IP

IP symbols represent a graphical form of communication that indicates whether a trademark, patent, or work is protected under Intellectual Property law. The correct use of these symbols helps holders notify the public and competitors about the rights they have over an invention, trademark, or creation, preventing unauthorized use. For a conscious use of these IP symbols, it is essential that inventors, artists, and companies understand the meanings and implications of each symbol..

TM: The symbol for an unregistered trademark.

The TM symbol, which stands for Trademark, is used to indicate that a mark is being used, although it has not yet been officially registered. This symbol is commonly used during the initial stages of brand development, prior to the formal registration process. However, TM does not provide definitive legal protection; it merely serves as a notice that the owner claims rights over the mark.


Thus, the use of the TM symbol is particularly relevant in the early stages of brand development, when there is a desire to prevent third parties from copying or using the same or a similar mark. However, it is important to emphasize that without formal registration, TM does not prevent others from registering an identical or highly similar mark, as it does not grant exclusive rights over the trademark.

C: The Copyright Symbol

The C symbol, which stands for Copyright, is used to indicate that a work is protected by copyright law. This symbol applies to literary, artistic, scientific, or musical creations, among others. The use of C serves as a visual notice that the work is under legal protection and that the author holds exclusive rights over its reproduction and use.


In Portugal, copyright registration is not mandatory, as protection is granted automatically upon the creation of the work. However, registration serves as proof of authorship in case legal disputes arise. The © symbol is therefore an important tool to discourage unauthorized use of the work, helping to safeguard the rights of creators.

R: The Registered Trademark Symbol

The R symbol, or Registered, is used exclusively for trademarks that have been officially registered with the National Institute of Industrial Property or another competent authority. The use of this symbol is only permitted after the registration process has been completed and the trademark has been officially recognized as the property of the owner.

Thus, when the R symbol is used, the owner is indicating that they have the exclusive right to use the trademark in the territory where it is registered and may prevent third parties from using it without authorization. The protection granted by a registered trademark is valid for a specific period, typically 10 years, with the possibility of renewal. Therefore, by using the R symbol, the trademark owner has the legal right to defend their intellectual property against unauthorized use or infringement by third parties.

Differences between TM, C, and R

The TM, C, and R symbols are used for different types of Intellectual Property, each serving distinct purposes. The TM symbol is used for marks that have not yet been registered but are intended to be protected by the owner. On the other hand, the C symbol is associated with works protected by copyright, while the R symbol is used for trademarks that have already been registered and have established legal protection.


The main difference between TM and R lies in legal assurance. TM does not guarantee exclusivity of the mark, while R ensures the exclusive right to exploit the trademark. Regarding C, this symbol is exclusive to literary, artistic, or scientific works, such as books, music, or paintings, and does not apply to trademarks or patents.

The Importance of Intellectual Property Symbols

Intellectual Property symbols play a key role in the legal protection of intellectual creations. The proper use of each symbol not only helps secure the rights to a creation but also serves as a deterrent against infringement. In this way, the public and competitors are alerted to the fact that a particular asset is protected by intellectual property rights.


Additionally, Intellectual Property symbols help prevent unfair competition. In the case of trademarks, for example, the use of the R symbol ensures that the owner has exclusive rights, preventing others from using a similar or identical mark for related products or services. In this way, the brand’s identity is preserved..

Trademark and Copyright Registration in Portugal

In Portugal, trademark registration is conducted with the National Institute of Industrial Property (INPI). The registration process involves submitting an application, examining the novelty, and verifying the originality of the mark. Upon completion of the process, the owner receives legal protection for the trademark for a period of 10 years, renewable. In this way, trademark registration grants the owner the exclusive right to use the mark, preventing others from registering a similar trademark.

Regarding copyright, in Portugal, protection is automatic from the moment the work is created, although registration is recommended to facilitate proof of authorship in the event of potential disputes.

Copyright registration is done at the Directorate-General for Books, Archives, and Libraries and provides legal security to the author in case of violation of their rights.

In summary, IP symbols are essential for the protection of intellectual creations and for clear communication regarding the legal status of trademarks, patents, and works. The TM symbol, for unregistered trademarks, and the R symbol, for registered trademarks, play a key role in signaling the use of assets. On the other hand, the C symbol ensures the protection of copyright and the defense of rights in case of litigation.