I am thinking of starting an automated YouTube channel. I am KSI and I want to take a YouTube channel by a Spanish YouTuber called "Fede Vigevani" which cannot bee understood by an English audience and then take out the original spanish audio and run Sidemen style commentary over the Fede Vigevani for an English audience. Is this fair use and is it monetizable since I am adding humorous, mischievious, comedic, entertaining and engaging commentary. I strongly disagree with you. Firstly, my changes are transformative as they add new expression or meaning to the video by adding comedic commentary thereby making them humorous and entertaining. Next, my videos cannot replace the original works or diminish their value as his videos do not reach an English speaking audience but a Spanish one which are totally different and thus my own videos would not provide a substitute to his Spanish audience. Here are YouTube copyrigt exceptions: What are Copyright Exceptions?
Copyright exceptions are laws that allow you to reuse someone else’s copyright-protected material without getting their permission, but only under certain circumstances.

In the US, the most widely known copyright exception is fair use. When deciding whether a use is fair, courts look at four factors: the purpose and character of the use, the nature of the copyrighted work, the amount and substantiality of the portion used in relation to the copyrighted work as a whole, and the effect of the use upon the potential market for or value of the copyrighted work. Some activities that may qualify as fair use include criticism, commentary, and news reporting. Fair use aims to promote freedom of expression.

In some civil law countries, including many in the EU, more limited exceptions are recognized where the reuse must fall within specific categories, instead of having factors that are weighed. The categories set out in Article 17 of the EU Digital Single Market copyright directive are quotation, criticism, review, caricature, parody, and pastiche. These words have their usual meaning in everyday language, but are also enacted into law by each member state and interpreted by both national courts and the Court of Justice of the European Union (CJEU). It is also important to consider the context of the use, and the purpose of such copyright exceptions, one of which is to balance creators’ freedom of expression, and rightsholders' copyright.

In some countries, such as Canada, the UK, and Australia, a hybrid concept of fair dealing exists. Courts weigh factors similar to those in fair use, but reuses must fall within specific categories. These categories include quotation (general quotation, and quotation for the purposes of criticism, review, or news reporting), caricature, parody, and pastiche.

Most countries in the world have signed an international treaty known as the Berne Convention, which allows reuses in specific categories, including for quotation, and news reporting.

While there are some similarities regarding copyright exceptions across the globe, there are still considerable differences between the laws of each country. There’s no one-size-fits-all answer as to whether a reuse falls within copyright exceptions, and the courts decide the applicability of such exceptions on a case-by-case basis.

At YouTube, our mission is to give everyone a voice and show them the world. Copyright exceptions play a key role in furthering this mission by supporting the free flow of ideas and creativity. Therefore, we ask rightsholders to consider the applicability of copyright exceptions before they submit copyright removal requests. We believe this would strike a balance between respecting the copyright of rightsholders, and creators’ freedom of expression that may be protected by copyright exceptions.

In addition, we build products that empower creators to access, create, and share information like never before. We’ve created an Audio Library for you to discover free high-quality music and sound effects that you can reuse safely. Now with YouTube Shorts, you can create short videos sampling someone else’s content, provided they have given you permission to do so. We're also continuing to build and expand Creator Music, which lets creators in the YouTube Partner program safely use commercial music by licensing tracks or sharing their video revenue with music rights holders.   Fair use on YouTube
Fair use is a legal doctrine that says use of copyright-protected material under certain circumstances is allowed without permission from the copyright holder.

YouTube gets many requests to remove videos that copyright holders claim are infringing under copyright law. Sometimes these requests apply to videos that qualify for copyright exceptions or seem like clear examples of fair use.

Courts have decided that copyright holders must consider whether copyright exceptions apply before they submit a copyright removal request.
If the use of copyright-protected material in a video qualifies as a copyright exception, then the video is considered lawful and non-infringing. This is why we often ask copyright holders to think about whether copyright exceptions apply before submitting a copyright removal request to YouTube. If a copyright holder believes a video doesn't qualify for an exception, then they must provide us with an adequate explanation as to why. 

If a copyright holder doesn't provide us with an adequate explanation as to why a video doesn't qualify for a copyright exception, then the video is not removed from YouTube. 
Copyright exceptions around the world
While international rules about copyright exceptions are often similar, they can differ. Different countries and regions may have different rules about when it's OK to use copyright-protected material without the copyright holder’s permission.

Keep in mind that we take local rules into consideration when responding to copyright removal requests. You can view the YouTube Copyright Transparency Report for more info on how we respond to copyright removal requests, including how often we request additional explanations from copyright holders who claim a video doesn't qualify for a copyright exception.
In the United States, works of commentary, criticism, research, teaching, or news reporting may be considered fair use. In the EU, more limited exceptions are recognized and the use must fit into specific categories, such as quotation, criticism, review, caricature, parody, and pastiche. Other countries/regions have a concept called fair dealing that may work differently.

Ultimately, courts decide fair use cases according to the facts of each unique case. You’ll probably want to get legal advice from an expert before uploading videos that use copyright-protected material.

Four factors of fair use
In the United States, judges decide what’s considered fair use. A judge will consider how the four factors of fair use apply to each specific case. The four factors of fair use are:

1. The purpose and character of the use, including whether such use is of commercial nature or is for nonprofit educational purposes
2. The nature of the copyrighted work
3. The amount and substantiality of the portion used relative to the whole copyrighted work
4. The effect of the use upon the potential market for, or value of, the copyrighted work
Example of fair use

"Donald Duck Meets Glenn Beck in Right Wing Radio Duck"
by rebelliouspixels

This remix combines short excerpts from different source materials. The remixes create a new message about the effect of provocative rhetoric in times of economic crisis. Works that create new meaning for the source material may be considered fair use.

YouTube’s fair use protection initiative
In rare cases, we’ve asked YouTube creators to join an initiative that protects some examples of “fair use” on YouTube from copyright removal requests. Through this initiative, YouTube indemnifies creators whose fair use videos have been subject to removal requests for up to $1 million of legal costs in the event the removal results in a copyright infringement lawsuit.

The goal of this initiative is to make sure these creators have a chance to protect their work. It also aims to improve the creative world by educating on both the importance and limits of fair use. Because of the variation in the rules governing such uses by different countries/regions, as described above, we're only able to offer this initiative to creators living in the United States who agree to have their videos are only available in the United States.

Reinstated fair use videos
You may be aware of some notable cases where we’ve asked copyright holders to reconsider removal requests and reinstate fair use videos. For example:

This video by the Young Turks, which shows short clips from a heavily criticized commercial as part of a conversation on why it offended viewers.
This video by Secular Talk, which criticizes a political figure for endorsing an unproven treatment for diabetes.
Buffy vs Edward: Twilight Remixed -- [original version], a remix video that compares the ways women are portrayed in two vampire-related works targeted at teens.
"No Offense", a video uploaded by the National Organization for Marriage, which uses a clip of a celebrity as an example of rude behavior.
More info
If you’d like to learn more about fair use, there are many resources available online. The following sites are for educational purposes only and aren't endorsed by YouTube:

Center for Media and Social Impact’s “Code of Best Practices in Fair Use for Online Video”
Digital Media Law Project's detailed explanation of the Four Factors
US Copyright Office’s fair use index