For international trademark transfer, the relevant conditions and materials required for transfer are slightly different in different countries. Here is a brief summary:

1. Some countries will require identical/similar trademarks. "Transfer together". In order to avoid confusion and misunderstanding by the public, identical or similar trademarks applied for registration on the same or similar goods/services should be transferred together, otherwise they will be rejected. Such as: Colombia.

2. Some countries require notarization or notarization of transfer materials. For countries with such requirements (such as Argentina and Ecuador), if the transferor and transferee are not of the same nationality, it may be difficult to apply for relevant documents.

3. Some countries will require proof of use to be submitted before the transfer application can be processed. For example, for a trademark under application in the United States, if the application is based on intention to use, when handling the transfer, the official will require evidence of trademark use to be submitted before the trademark transfer procedure can be processed.

4. Some countries require that only registered trademarks can be transferred. For example, Malaysia can only transfer registered trademarks. Even if a transfer application is submitted for the trademark under application, the official will usually put the transfer application on hold until the trademark is registered and then review it.