The Intellectual Property Issue with Hosting OEM Documents
OEM service manuals, TSBs, and diagnostic guides are copyrighted works. Publishing them on a third-party website without authorization from the copyright holder — even for ostensibly educational purposes — constitutes copyright infringement. Most OEM documents are explicitly marked as proprietary. The fact that a document can be found online does not mean it is in the public domain or that hosting it is permitted.
Some websites host OEM PDFs in apparent good faith, reasoning that broader access to diagnostic information is beneficial. The legal risk is real regardless of intent — OEMs actively monitor for unauthorized republication of their service materials and have pursued legal action against infringers. This site does not host OEM documents, not because they lack value, but because hosting them without authorization creates legal exposure that would risk the site's continued operation.
Linking vs. Hosting: The Practical and Legal Difference
Linking to a document that the OEM or government agency makes publicly available on their own servers is different from hosting a copy. A link to NHTSA's public TSB database, or to Cummins QuickServe's public portal, directs the user to the original source — the OEM controls what is shown, and the user accesses the most current version. A hosted copy is a snapshot that may be outdated and that removes the OEM's control over their own materials.
This site's source citations link to the primary source where possible. When a source document is only available through a registration-required portal (like many OEM dealer tools), the source registry records the portal URL and the document's identity within it. Users can access the original by registering with the appropriate service.
Government Documents and the Public Domain
Federal government publications produced by U.S. government employees as part of their official duties are in the public domain under 17 U.S.C. § 105. This includes FMCSA guidance, NHTSA safety communications, EPA emission standards documents, and eCFR text. Reproducing these documents is legally permissible.
Even with public-domain government materials, this site chooses to use original explanatory language rather than copying document text. The reason is accessibility — regulatory text is written for legal and enforcement purposes, not for drivers trying to understand what an ELD malfunction means on a Tuesday afternoon on I-80. Explaining the regulatory concept in plain language, with a citation to the source for verification, serves readers better than reproducing the original.
What Happens When Source Documents Become Unavailable
Public documents can disappear — NHTSA databases are reorganized, OEM portals restructure their content, and government sites migrate URLs. When a linked source document becomes inaccessible, the pages that depend on it are reviewed. If an equivalent accessible source can be identified, the source registry is updated and the citation link is corrected. If no equivalent source is accessible, the page's confidence level may be downgraded and the content reviewed for accuracy.
The source registry records the accessed date for each source document. This allows the editorial review process to prioritize pages with older accessed dates — those are the most likely to have source links that need refreshing. Routine source review is part of the site's ongoing maintenance.
Related Pages
Sources
- SAE J1939 Standards Collection SAE International · official · accessed 2026-05-05 · confidence medium
Source: SAE International, SAE J1939 Standards Collection. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - ELD Malfunctions and Data Diagnostic Events Federal Motor Carrier Safety Administration · government · accessed 2026-05-05 · confidence high
Source: Federal Motor Carrier Safety Administration, ELD Malfunctions and Data Diagnostic Events. This page paraphrases factual fields only and is not a substitute for the original document.
Open source - 49 CFR 395.34 - ELD malfunctions and data diagnostic events Electronic Code of Federal Regulations · government · accessed 2026-05-05 · confidence high
Source: Electronic Code of Federal Regulations, 49 CFR 395.34 - ELD malfunctions and data diagnostic events. This page paraphrases factual fields only and is not a substitute for the original document.
Open source
FAQ
Why does this site link to sources rather than hosting OEM documents?
Hosting OEM PDF documents raises intellectual property concerns — most OEM service publications are copyrighted. Publishing them without authorization would expose this site to copyright claims. More fundamentally, linking to the original source ensures users access the most current version of a document rather than a potentially outdated copy. Current OEM and government document sources are more reliable than mirrored files.
What happens when a linked source document becomes unavailable?
When a source document link breaks or a document is removed from its public location, the source confidence level for pages depending on that document is reviewed. Pages may be demoted to medium confidence or moved to noindex status if the sourcing cannot be replaced with an equivalent accessible document. The source registry tracks document availability as part of routine maintenance.
Are there any exceptions where document content is reproduced?
Only for text that is in the public domain, from government documents explicitly designated as free of copyright restriction, or under an explicit permission grant. Most federal government publications (FMCSA, EPA, NHTSA) are in the public domain, but this site still uses original explanatory language rather than copying document text — both to comply with this policy and to ensure the explanations are accessible to non-technical readers.