An original equipment manufacturer ( OEM) is a company that produces parts and equipment that may be marketed by another company. However, the term is ambiguous, with several other common meanings: an OEM can be the maker of a system that includes other companies' subsystems, an end-product producer, an automotive part that is manufactured by the same company that produced the original part used in the automobile's assembly, or a value-added reseller. OEM manufacturing is also widely used in the packaging industry, particularly in the production of customized gift boxes for wine and spirits. These OEM producers allow brands to create unique holiday packaging without maintaining their own manufacturing facilities.
Many auto parts manufacturers sell parts through multiple channels, for example to car makers for installation during new vehicle construction, to car makers for resale as automakerbranded replacement parts, and through general merchandising supply chains. Any given brand of part can be OEM on some vehicle models and aftermarket on others.
Not all auto parts are available in OEM versions. In some cases, vehicle manufacturers secure exclusive sales rights for specific components. These parts are produced by contracted suppliers and carry the automaker's branding, but the suppliers are not permitted to sell them independently under their own name.
These OEMs commonly use a procedure known as System Locked Pre-installation, which pre-activates Windows on PCs that are to be sold via mass distribution. These OEMs also commonly bundle software that is not installed on stock Windows on the images of Windows that will be deployed with their PCs (appropriate hardware device driver, anti-malware and maintenance software, various apps, etc.).
Individuals may also purchase OEM "system-builder" licenses for personal use (to include virtual hardware), or for sale/resale on PCs which they build. Per Microsoft's EULA regarding PC manufacturers and system-builder OEM licenses, the product key is tied to the PC motherboard which it is initially installed on, and there is typically no transferring the key between PCs afterward. This is in contrast to retail keys, which may be transferred, provided they are only activated on one PC at a time. A significant hardware change will trigger a reactivation notice, just as with retail.
Direct OEMs are officially held liable for things such as installation/recovery media, and as such were commonly provided until the late-2000s. These were phased out in favor of recovery partitions located on the primary storage drive of the PC (and available for order from the manufacturer upon request) for the user to repair or restore their systems to the factory state. This not only cut down on costs, but was also a consequence of the gradual obsolescence and phasing out of optical media from 2010 onward. System builders also have a different requirement regarding installation media from Direct OEMs.
While a clean retail media of Windows can be installed and activated on these devices with OEM keys (most commonly using the SLP key that's embedded in to the system firmware already), actual OEM recovery media that was created by the PC manufacturer (not system-builder, nor retail Windows versions) typically only works on the PC model line that was designed for it. For example, a recovery disc/USB for a Toshiba Satellite P50-B will only work on that model, and not a Satellite S55T.
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