A. Clear Communicative Function

The video is a short essay advocating for the addition of stacked range bar charts into various plotting applications. The top layer of the narrative is an explanation of how stacked range bar charts work and in what situations they are optimal, while carrying the secondary intent of persuading software developers to implement a new function to facilitate the creation of said charts.

B. Linguistic Density and Variety

Just like the previous case, the speaker is using a casual but polite tone, in order to ease the viewer into a learning mindset. The speech is fast-paced, due to the nature of the channel, and uses jargon related to software development and mathematics, which presents a challenge of length and continuity. The educational factor requires this vocabulary to be presented in a way that is simple to understand for untrained audiences.

C. Technical Constraints (Essential for AV Localization)

In order to comply with YouTube captioning standards, and to avoid the need to rectify timestamps for the subtitles, each line in the localized subtitles must be able to occupy the same number of characters as the original, with a margin of error of one short word. The text on screen must also be translated, which will require embedding new additions via video editing software. To facilitate the analysis of the localization, both the original and the localized subtitles must also be embedded into the video, without altering the original content.

D. Legal & Ethical Usability

According to the principle of fair use, YouTube videos can be modified and reuploaded on the following conditions:

Purpose and character of the use: Nonprofit education uses are more likely to be considered fair use than commercial uses. Adding new expression or meaning to the original material is more likely to be considered fair use than merely copying the original.

Nature of the copyrighted work: Using material from primarily factual works is more likely to be considered fair use than using purely fictional works.

Amount and substantiality of the portion used: Borrowing small bits of material from an original work is more likely to be considered fair use than borrowing large portions. But, if what’s borrowed is considered the "heart" of the work, sometimes even a small sampling may not be considered fair use.

Effect of the use upon the potential market: Uses that harm the copyright holder's ability to profit from their original work are less likely to be fair uses. Courts have sometimes made an exception under this factor in cases involving parodies.

Link

Given these principles, here is how this localization qualifies:

1. Purpose and character of the use: Non-commercial. The video will be uploaded unlisted, with ads disabled, to a currently unmonetized YouTube account. It will be produced as a work sample with no intent of direct profit, and measures will be taken both within and around the upload to dissuade casual audiences from viewing it as substitution of the original.
2. Nature of the copyrighted work: A brief description of a real-life problem and an appeal for a solution does not typically constitute copyrightable text. Although the visual elements do, they are not the focus of this exercise, and may be edited out at the request of the copyright holder.
3. Amount and substance of the portion used: While the video itself will be used in its entirety, this constitutes only one out of 297 episodes in a series, or approximately 0.03% of it. The topic itself also falls out of the typical scope for the channel’s content, which minimizes its impact on the whole.