Co-Branded items are items which have another brand name, logo or trade dress on the box, in the set contents or in the set name. A co-brand category is created for each brand. A brand can be of a real company, person or service or be fictitious such as Octan.
Educational sets that contain branded parts or minifigs such as Octan are not tagged as co-branded. All item types can be tagged as co-branded except parts. Under parts, only items in the Brick, Promotional and Duplo, Brick Promotional categories can be tagged as co-branded.
In general, items which have been only available for sale at a specific location but the box, set contents or set name do not show the brand are not considered co-branded. This includes wholesale exclusives available only at a specific retail chain and items available only at Legoland Parks.
Licensed product lines such as Star Wars, Indiana Jones, etc. which already have their own category are not tagged as co-branded. There may be an exception to this if there is a licensed line but the brand also appears in others sets which are not part of that line, for example Ferrari. In such case, a co-brand category is created and all sets containing parts with that brand are tagged.
The following is an explanation of abbreviations and logos on 4.5V/12V train stickers: