How do you protect your trademark around the world?

It is important to understand that a right over a trademark is a restriction on commerce. Once a trademark is granted to a market the others may not use an identical or substantially similar trademark to mark the same class of products.

 Register trademark in Vietnam

Now since trademark owners must use its trademark to keep their rights and since trademark law is regulated mostly State by State it is not possible to protect a trademark unless you really participate in all demographic markets of the world, like Coca-Cola, although there are places of the works where Coca-Cola is not sold.

There are some internal systems which allows you to protect a trademark in several countries with one registration. Nevertheless, if you don't really use that trademark in each of those countries you may end up loosing it because trademarks must be used.

Finally, keep in mind that if you want to protect your trademark globally you will need to have a good trademark protection and prosecution strategy.

ANT Lawyers - A Law firm in Vietnam is supported by a team of experienced patent, trademark, design attorneys with qualification and skills handling full range of legal services relating to intellectual property rights in Vietnam.  We have specialized in the preparation and registration of patents, trademarks and designs for our clients.

Source: Quora

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Should I trademark nationally or internationally if I will be taking clients worldwide?

Trademarks are intangible assets, and can be bought, sold or licensed, making your company more valuable. Trademark establishes a link between enterprise and customer.  A strong trademark will attract customers to use goods or services.

Do you have to buy trademark in all countries? 

What's the best way to register an international trademark?

However, you have to analyze your company to determine the value in seeking trademark protection in foreign countries. An experienced intellectual property (IP) attorney is the best person to speak to regarding this decision. There is a mechanism for obtaining a trademark in other countries: the  Madrid Protocol

 International Trademark Registration Under Madrid Protocol/ Agreement

To sum it up, you should first file for a trademark in your home country. From there, your country will forward it to WIPO. After WIPO examines it, and hopefully approve it, it will send you a certificate of your international registration and notify the IP Offices in all the territories where you seek trademark protection in. The last step is for those territories to make a decision within the time limit (12 or 18 months) in accordance with their own rules. WIPO will record the decisions of the IP Offices in the International Register and notify you when they are made. If a particular Office refuses to grant protection, you can contest a refusal decision directly before it. Conversely, if an IP Office accepts to protect your mark, it will issue a statement of grant of protection.

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