The "source" suffix usually indicates the highest-quality version of a video before it is compressed for different streaming resolutions.

Knowing the website or application where it appeared would help in identifying the specific content or the type of report you need.

If you are looking for a report related to this specific video, it may be associated with one of the following:

In some cases, specific file hashes or names are referenced in transparency reports or legal investigations involving digital forensics, though these usually use standardized hash values (like MD5 or SHA-256) rather than temporary filenames .