En fait, pour IBM, c'est encore plus tordu, puisque c'est à la fois un nom et un acronyme :
"IBM", the 3 letters in text, is both a trademark (product name) of International Business Machines Corporation, and an abbreviation of its company name. When "IBM" is used to identify the company International Business Machines Corporation, it is called a trade name. Trade name usage typically applies when referring to a company as opposed to a particular product. It is permissible to use IBM as a possessive if you are referring to IBM the company. In that case the name does not identify goods or services (which are legally the domain of trademarks).
[^] # Re: ISO
Posté par ang . En réponse à la dépêche Le Linux Standard Base devient une norme ISO. Évalué à 2.
"IBM", the 3 letters in text, is both a trademark (product name) of International Business Machines Corporation, and an abbreviation of its company name. When "IBM" is used to identify the company International Business Machines Corporation, it is called a trade name. Trade name usage typically applies when referring to a company as opposed to a particular product. It is permissible to use IBM as a possessive if you are referring to IBM the company. In that case the name does not identify goods or services (which are legally the domain of trademarks).
source : http://www.ibm.com/legal/copytrade.shtml