The initiative is open for everybody. Independent software vendors can decide, whether they want to get offered a licensing by an OSSii party. See Contacts for more information about who to contact. Which interfaces can be licensed is defined in the bi-lateral agreements between the initiating parties.
Every company can become part of it by signing bi-lateral agreements with other companies. The conditions and interfaces to be licensed are the same for all vendors who are bringing in their own OSSii interfaces. If an independent software vendor without own OSSii interfaces want to get the benefits, the interfaces license will be offered on fair, reasonable and non discriminating basis. The terms for licensing need to be agreed with every vendor separately.